Solvent recovery device of long-carbon-chain binary acid refining production process

Abstract

The invention belongs to the technical field of preparation of long-carbon-chain binary acids by a biological fermentation method, in particular to a solvent recovery device of a long-carbon-chain binary acid refining production process. The invention adopts the technical scheme that the solvent recovery device of the long-carbon-chain binary acid refining production process comprises a raw material pot, wherein the raw material pot is sequentially connected with a decompression tower preheater and a decompression tower reboiler A through a pipeline; the inner bottom of the decompression tower is divided into a left side and a right side by a vertical longitudinal baffle plate; the right bottom of the decompression tower is sequentially connected with a reboiler B, a kettle liquid preheater, a normal-pressure tower and a normal-pressure tower reboiler through a pipeline; the kettle liquid preheater is sequentially connected with the decompression tower preheater, an acetic acid condenser and a finished product pot through a pipeline; a heavy component is extracted out of the left side of the decompression tower; and an semi-finished acetic acid product is extracted out of the right side of the decompression tower and put into the normal-pressure tower to separate out a finished product. In the refining process, the invention saves the energy, reduces the consumption, reduces the production cost, improves the product quality, protects the surrounding environment and brings good economic benefit to enterprises.

Description

technical field [0001] The invention belongs to the technical field of preparing long-carbon-chain dibasic acids by a biological fermentation method, and in particular relates to a solvent recovery device in the refining production process of long-carbon-chain dibasic acids. Background technique [0002] Long chain dicarboxylic acids (Long chain dicarboxy acids) refer to aliphatic dicarboxylic acids (DC for short) containing more than 10 carbon atoms in the carbon chain. n ), including saturated and unsaturated dicarboxylic acids, is a class of fine chemical products with important and extensive industrial uses. , high-grade lubricants, high-grade paints and coatings and other important raw materials. [0003] The production of long carbon chain dibasic acids by biological fermentation is the application of microbial fermentation technology in the field of petrochemical industry that emerged in the 1970s. It uses wax oil, a by-product of petroleum, as a raw material. It has...

AI Technical Summary

Problems solved by technology

[0004] At present, the technology adopted by long-chain dibasic acid production enterprises can only produce dibasic acid crude products (called P grade products), but the dibasic acid crude products have low monoacid content, poor thermal stability, low purity, ash and iron The salt content is high, and the product quality cannot meet the quality standard of polymer grade, which cannot meet the high-quality requirements of customers, which greatly limits the application range of long-chain dibasic acids

In the refining process of the long carbon chain dibasic acid invented by the applicant, the isolated primary crystallization mother liquor contains heavy components and a large amount of solvent acetic acid. If it is discharged as waste water, it will not only pollute the environment, but also waste a large amount of acetic acid solvent, and In the new refining process, new acetic acid solvent will be added, which will greatly increase the production cost

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