Production process of non-phosgene synthesis of scarlet acid

Abstract

A production process of the non-phosgene synthesis of scarlet acid particularly comprises the following steps: firstly dissolving J acid into water, adjusting the pH of the solution medium with 30% liquid alkali to obtain a pH of about 7, after complete dissolution, adding bis(trichloromethyl)carbonate with a theoretical amount being 16.7% of the feeding amount of the J acid, performing phosgenation reaction under a controlled temperature of 35-65 DEG C, wherein a reaction end point is reached when no NaOH is consumed and the content of the J acid in materials is not more than 5 g / L. In the process, the amount of bis(trichloromethyl)carbonate approaches the theoretical amount, so the amount of the liquid alkali is reduced by two-thirds; the inorganic salt content in the product is greatly decreased; the product quality is improved; the reaction condition is safe and moderate; the danger of the phosgene toxicity is eliminated essentially; and the process is applicable to industrial production.

Description

Technical field: [0001] The invention belongs to a production process of chemical products, in particular to a production process of utilizing bis(trichloromethyl)carbonate to synthesize scarcinic acid. Background technique: [0002] Scarcinic acid is the main intermediate in the production of dyestuffs. The traditional synthesis method is to use phosgene to phosgenate condensation of J acid under the condition of PH=7.0, and then obtain it through processes such as salting out and drying. Due to the continuous expansion of the dyestuff market in recent years, the demand for carcinic acid has also increased year by year. However, because carcinic acid is restricted by the raw material phosgene in the manufacturing process, the carcinic acid market is in short supply. Phosgene is an important chemical raw material, which is widely used in chemical fields such as medicine, pesticides, polymer materials, and dyes. However, phosgene is a highly toxic gas, and its production, tr...

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Problems solved by technology

However, phosgene is a highly toxic gas, and its production, transportation, storage and use are all extremely dangerous. The phosgenation reaction of the gas phosgene must be produced and used on the spot

The phosgenation reaction is not only dangerous and violent, but also cumbersome to operate, and transportation is strictly prohibited. In this way, the production of scarcinic acid is greatly restricted, and the production cost is increased in the production process.

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