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Production process of non-phosgene synthesis of scarlet acid

A production process and technology of scarlet acid, applied in the preparation of sulfonic acid, organic chemistry, etc., can solve the problems of increased production cost, severe reaction, complicated operation, etc., and achieve the effects of improving product quality, safe reaction conditions, and safe and convenient transportation.

Inactive Publication Date: 2011-06-29
天津节省资源利用工程技术有限公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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  • Production process of non-phosgene synthesis of scarlet acid
  • Production process of non-phosgene synthesis of scarlet acid

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Embodiment Construction

[0010] 1. Put 2500L of water in a 5000L reactor (the first batch uses water once, and the second batch uses 2000L of mother liquor from the previous batch), then pour the J acid into the reactor and turn on the stirring to make the J acid stir evenly , then adjust the pH of the solution medium to about 7 with 30% liquid caustic soda, make it all dissolve, then measure the temperature in the reactor, then observe whether the material is completely dissolved, adjust the volume to 3500L after fully dissolved, then add the weighed two ( Two-thirds of the amount of trichloromethyl)carbonate, the temperature is raised to 30°C, and the change of the reaction medium is measured at any time. When the pH of the reaction medium is lower than 7, slowly add 30% liquid caustic soda to keep the reaction medium Around PH=7.

[0011] 2. In the process of phosgenation, the reaction speed will slow down when the temperature remains constant, so there is no need to increase the temperature in the...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C309/51C07C303/22
Inventor 赵会兰郭成铁郭庆林王世洪郭成新张小静
Owner 天津节省资源利用工程技术有限公司
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