Raw materials for the production of counter esters? ?
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Conjugate esters are the most important intermediates for vinylsulfonyl-type reactive dye. Does anyone know what its ingredients are? What role does sodium metabisulfite play in it? ?
The synthesis of para-esters is primarily carried out using the sulfurous acid method. The first step is chlorosulfonation, in which chlorosulfonic acid sulfonates the aromatic ring first, and then the resulting sulfonic acid is converted into an acyl chloride. The reaction equation is: Ar-H + HSO3Cl → Ar-SO3Cl + H2SO4 + HCl. The second step is reduction; the most common method for reducing the acyl chloride to a sulfurous acid is to use sodium sulfite as a reducing agent. However, sometimes, in order to improve the efficiency of the reducing agent, sodium pyrosulfite, which contains a higher amount of sulfur dioxide, is used. So, to answer your question about what sodium pyrosulfite is used for: it is used as a reducing agent. The reaction equation is as follows: Ar-SO2Cl + Na2SO3 + NaOH → Ar-SO2Na + Na2SO4 + NaCl. In the third step, the product obtained in the second step reacts with ethylene oxide to form hydroxyethyl sulfone; the resulting product is then esterified with sulfuric acid to yield the final product
Where are the manufacturers of conjugate esters? ? ?
Hubei Chuyuan High-Tech Co., Ltd. produces para-esters.
It is also available in Hebei; the main raw materials include antipyretic ice as well
What is the annual production volume of paraesters by this company?
Para-ester is one of the ethylene sulfone-type intermediates of reactive dyes; it can be synthesized using acetanilide, p-nitrochlorobenzene, and *** as raw materials.
Our company produces p-ester 591 and chlorosulfonic acid.
What I saw at my client’s place was a powdered alignment grease, from Kaifeng, Henan
I know that factory you’re talking about; it’s Kaifeng Longxing Chemical, with an annual production capacity of over 10,000 tons. Its manufacturing process isn’t very complex
There are nearly a dozen manufacturers of ester derivatives in China, among whom the one with the largest production capacity is Hubei Chuyuan High-Tech Chemical Co., Ltd., with an annual production capacity of 25,000 tons； Next is the Xinxiang Satellite Dyeing and Chemical Factory in Henan Province, with a production capacity of 12,000 tons per year ； The third is Hebei Chengde Kreet Chemical Materials Co., Ltd., with a production capacity of 10,000 tons per year.