As a new foreign trade service provider driven by both technology transformation and foreign trade services, HiSiaddi has established a "1+2+3+4=1" service system and can supply tetraphenylporphyrin from multiple well-known original manufacturers.
As a research-and-development-oriented new foreign trade enterprise, HiSiaddi has repeatedly proposed formula optimization schemes and application improvement suggestions for tetraphenylporphyrin products by virtue of technological transformation cooperation with factories and precise insight into market demands. The following is a case of HiSiaddi’s formula optimization consulting service for tetraphenylporphyrin products.
If you need more formula optimization consulting services, please contact HiSiaddi customer service.
The cooperating buyer, Germany OptoSense GmbH, is located in the high-tech optoelectronic industrial park of Stuttgart, Germany. Founded relying on the organic optoelectronics laboratory of the University of Stuttgart, it specializes in R&D of organic photovoltaic and organic nonlinear optical materials, with products supporting the New Materials Research Institute of Bosch Germany and key EU federal optoelectronic laboratories. Tetraphenylporphyrin (TPP, CAS: 917-23-7) serves as the core photosensitive doping raw material for preparation of active layers of organic solar cells and trial production of optical sensing chips. Its internal control standards align with Germany’s DIN optoelectronic material specifications, and it purchases stable annual supplies of 1.2kg high-purity grade products from local European fine chemical manufacturers.
Faced with rising overseas chemical raw material prices and extended import lead times of up to 105 days, the client selected a domestic fine chemical customization factory to purchase 350g high-purity tetraphenylporphyrin raw materials after sample screening. The vacuum light-shielded packaged goods were airfreighted to the client’s German laboratory for warehousing. After the raw materials were put into optoelectronic slurry preparation and film coating on-machine tests, batch technical failures emerged continuously: fine insoluble particles precipitated in the slurry, excessive fluctuation in photoelectric conversion efficiency of thin films, abnormal impurity peaks in UV spectra, accelerated aging and failure of devices, and the product yield dropped from 97.6% with imported raw materials to 51.2%. The client’s planned EU special optoelectronic research project was forced to halt, with total losses from scrapped raw materials, consumables and test failures equivalent to 21,800 EUR.
The domestic supplier could only slightly adjust feeding ratios within its mature mass-production formula, and was restricted by fixed synthetic routes and purification processes, making it impossible to fundamentally rectify defects from the formula system and production process. Upon recommendation by Germany’s Fine Optoelectronic Materials Industry Association, the client entrusted Shanghai HiSiaddi Technology (HiSiaddi) as a third-party technical service foreign trade enterprise. Supported by a team of organic synthesis engineers, we disassembled and tested defective samples, systematically identified and resolved all technical problems from four dimensions: base raw material selection, synthetic formula reconstruction, multi-stage purification processes and client-side feeding application processes. After rectified raw materials passed re-testing and reached standards, new supplies were delivered, and a long-term fixed annual procurement framework of 1kg was subsequently signed.
Product Specification: Optoelectronic-grade high-purity tetraphenylporphyrin, black-purple crystalline powder, light-proof sealed packaging in fluorinated bottles, with batch-by-batch COA test reports, original HPLC chromatograms and SDS safety data sheets attached.
To cut production costs, the original factory adopted industrial unrectified benzaldehyde and ordinary pyrrole containing peroxide impurities as starting raw materials. These two basic raw materials contain trace impurities such as phenols and unsaturated hydrocarbons, which participate in side reactions under the propionic acid high-temperature reflux synthesis system to generate various trace heterocyclic by-products with similar structures. Such impurities cannot be fully detected via conventional large-batch liquid chromatography testing. After mixing into optoelectronic slurry, they cannot be completely dissolved by organic solvents, precipitating tiny visible particles that block coating heads and cause pinhole defects on thin film surfaces. Meanwhile, residual trace metal ion catalysts from by-products raise device leakage current and shorten the service life of optoelectronic components.
The factory adopted the traditional uncontrolled-temperature Adler synthetic formula with crude empirical adjustment of molar feeding ratios of pyrrole and benzaldehyde, unoptimized gradient addition of propionic acid catalyst, and uncontrollable heating rate of reaction kettles. Local overheating of the system generated massive chlorin impurities with a measured content as high as 1.12%. The UV characteristic absorption of chlorin overlaps with that of tetraphenylporphyrin, creating abnormal impurity peaks in finished product UV spectra, directly interfering with the light absorption coefficient of optoelectronic materials and causing volatile photoelectric conversion efficiency of solar cells, failing to meet standardized test data requirements for research projects.
Finished products only underwent a single crude recrystallization with methanol, without supporting gradient silica gel chromatography and low-temperature solvent refining procedures. Crude products encapsulated inorganic salts and high-molecular viscous impurities inside; high-temperature atmospheric drying was adopted in the drying stage, causing partial thermal oxidative degradation of tetraphenylporphyrin to generate new impurities. The measured ignition residue of finished products reached 0.38%, far exceeding the client’s application limit of ≤0.1%. Impurities triggered phase separation in organic resin matrices, which was the key inducement for slurry stratification and accelerated device aging.
The German laboratory long prepared optoelectronic slurry formulas based on the solubility and particle size indicators of European imported high-purity TPP. After modification and purification processes of domestic raw materials, obvious differences emerged in product particle size distribution and solubility in different organic solvents, making the original feeding ratios of resin, solvent and porphyrin no longer compatible. This further amplified application failures including powder precipitation and poor film formation. The client’s R&D staff repeatedly adjusted ingredient proportions yet failed to eliminate product defects at the root.
HiSiaddi set up a special fine chemical technical team with a 22-day cycle for formula optimization and sample verification, cooperating with upstream synthetic factories to implement rectification measures item by item.
1.
Replace High-Purity Starting Raw Materials to Cut Off Impurity Generation Paths at the Source HiSiaddi eliminated the original industrial-grade basic raw materials and specified procurement of pharmaceutical-grade rectified benzaldehyde (aldehyde purity ≥99.95%, free of phenolic impurities) and deoxygenated refined pyrrole (peroxide content <1ppm). Raw materials were sampled for chromatographic impurity screening before warehousing to avoid introduction of external impurities at the front end of synthesis and strictly control the entry of heavy metals and inorganic salts into the synthetic system.
2.
3.
Reconstruct Catalytic Synthetic Formula to Accurately Control Ratios and Suppress By-Product Generation Abandoning the crude high-temperature full-reflux formula, we optimized a modified low-temperature temperature-controlled synthetic system: precise molar ratio of pyrrole to benzaldehyde at 1:1.025, dropwise addition of benzaldehyde in batches to avoid local raw material excess, a compound catalytic system of propionic acid solvent with trace modified Lewis acid, segmented stepwise heating and full nitrogen sealed protection during the reaction to isolate air oxidation. From a formula perspective, the generation of chlorin by-products was controlled within 0.07%. After 12 parallel formula small trials, the final finalized synthetic formula was confirmed.
4.
5.
Customized Three-Stage Gradient Purification Process to Remove Trace Residual Impurities A complete set of refined procedures was added to crude post-processing:
6.
1. Step 1: Low-temperature mixed solvent recrystallization with dichloromethane and anhydrous ethanol to remove macromolecular viscous impurities;
2. Step 2: Neutral silica gel column chromatography with 200–300 mesh silica gel, fractionally collecting target components by polarity to separate isomer impurities;
3. Step 3: Vacuum low-temperature negative-pressure drying to eliminate thermal oxidative degradation. The final finished product had ignition residue reduced to 0.08% and HPLC main content increased to 99.52%, with all physical and chemical indicators meeting the client’s standards for optoelectronic raw materials. Optimized 50g samples were sent to the German laboratory for initial screening and passed all physical and chemical tests in one go.
7.
Remote Guidance for Client to Optimize Slurry Preparation Processes HiSiaddi compiled German-English bilingual application guidelines, remotely connected with the laboratory’s R&D engineers, and adjusted organic solvent ratios, resin feeding proportions and dispersion stirring rates combined with the solubility and particle size data of optimized domestic TPP, as well as optimizing slurry heating and dissolution procedures to resolve powder precipitation and stratification issues. After 72 consecutive hours of film coating sample testing by the client, thin films were uniform without pinholes, and the stability of optoelectronic parameters returned to the same level as imported raw materials.
8.
1.
Return and Re-Refining of Inventory Products for Smooth Delivery to Recover Economic Losses The original 350g unqualified raw materials were shipped back to the factory in batches for re-refining processing using the optimized synthetic formula and purification process. After rectification, light-proof vacuum packaged goods were airfreighted to Stuttgart, Germany. After raw materials were applied to research project trials, the yield of optoelectronic components rebounded to 97.3%, the EU special R&D project was delivered on schedule, and losses of 21,800 EUR from test delays were successfully recovered. The unit procurement price of optimized domestic tetraphenylporphyrin dropped by 31.6% compared with European imported raw materials, and delivery lead time was shortened from 105 days to 36 days.
2.
3.
Signing of Annual Procurement Framework Three months after rectification delivery, Germany’s OptoSense GmbH signed a 1kg annual procurement agreement for high-purity tetraphenylporphyrin with HiSiaddi, fixing the finalized synthetic and purification formulas confirmed in this optimization project. The agreement stipulates that HiSiaddi will synchronously fine-tune raw material indicators each year based on the client’s R&D progress of new optoelectronic materials, and complete full-item third-party testing in advance before each batch shipment. Subsequent development of zinc-coordinated tetraphenylporphyrin derivative optoelectronic raw materials by the client was fully entrusted to HiSiaddi for new formula customized R&D.
4.
5.
Expansion of Research Institute Clients in Europe Supported by This Benchmark Case Leveraging the successful rectification case for Germany’s high-end optoelectronic materials and the client’s European research circle resources, HiSiaddi subsequently connected two mid-to-high-end research procurement clients: the Optoelectronics Laboratory of Eindhoven University of Technology in the Netherlands and the Institute of Applied Chemistry in Vienna, Austria. We replicated the full-chain technical service model of "raw material screening + formula optimization + purification technical renovation + end-user application guidance" to deliver multiple foreign trade customized orders for porphyrin derivatives.
6.
Most domestic fine chemical factories mass-produce general industrial-grade tetraphenylporphyrin with synthetic formulas and purification processes designed for low-cost mass production, lacking capabilities for refined formula optimization aligned with high-end optoelectronic and pharmaceutical fields in Europe and America. Long-term use of imported high-purity raw materials by overseas mid-to-high-end research institutions formed fixed slurry preparation and product application parameters; deviations in physical and chemical properties of domestic raw materials rendered original application processes incompatible. The superposition of these two factors triggered end-user application failures.
Breaking the traditional foreign trade model limited to supply matching, HiSiaddi relies on professional organic synthesis technology to connect the full industrial chain of upstream raw material selection, synthetic formula reconstruction, refined process upgrading and downstream application process guidance, fundamentally resolving technical defects in product end-use. We not only helped high-end German research clients avoid research project suspension and massive test losses, but also bound high-quality European end clients through professional technical capabilities. Amid the steady growth of global demand for high-end customization of fine chemicals and continuously tightening indicator standards for new European and American materials, technology empowerment has become the core competitiveness for domestic high-end fine chemical products to enter mid-to-high-end European research supply chains.
If you need more formula optimization consulting services, please contact HiSiaddi customer service.
+86-13120989737 
info@hisiaddi.com 
English
