Production method of high-purity 1,4-butanediol

Abstract

The invention relates to a production method of high-purity 1,4-butanediol. The production method mainly comprises the working sections of formaldehyde, ethynylation, hydrogenation and product rectification, wherein according to the working section of formaldehyde, raw materials methyl alcohol and air generate formaldehyde under the effect of a catalyst; according to the working section of ethynylation, ethyne and formaldehyde are subjected to an alkynal reaction to generate refined 1,4-butynediol under the effect of a catalyst; according to the working section of hydrogenation, under the certain pressure, 1,4-butynediol and hydrogen from the upstream burner gas purification working section generate crude 1,4-butanediol under the effect of a catalyst; according to the working section of rectification, rectification treatment is performed on the 1,4-butanediol to obtain the high-purity 1,4-butanediol product. After the technology is applied, the product can directly enter the high-end downstream market, expansion and application in the high-end field are achieved, the distance between the 1,4-butanediol and oil law products is shortened, the method has the important demonstration effect on processing units for producing high-end 1,4-butanediol products through non-oil-law paths, and the technology and the product are wide in application prospect.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for producing high-purity 1,4-butanediol. Background technique [0002] 1,4-Butanediol, referred to as BDO, is one of the methanol series product chains and an important basic organic chemical and fine chemical raw material. Its main derivatives mainly include polybutylene terephthalate, polyurethane Resin, spandex, γ-butyrolactone, N-methylpyrrolidone, etc. BDO derivatives are fine chemical products with high added value, widely used as solvents, medicines, cosmetics, plasticizers, curing agents, pesticides, herbicides, foam artificial leather, fibers and engineering plastics. With the development of important downstream products of 1,4-butanediol, 1,4-butanediol has also developed rapidly. [0003] As an important organic chemical and fine chemical raw material, BDO can derive many high value-added downstream products. Many foreign BDO manufacturers do not ...

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Problems solved by technology

[0008] Although there are many technologies for producing high-purity 1,4-butanediol by the alkyne aldehyde method, there are still some deficiencies and shortcomings: (1) During the catalytic hydrogenation reaction of 1,4-butanediol, the reaction temperature The improvement of side reactions gradually increases, mainly reflected in the overhydrogenation of BDO and the dehydration and dehydrogenation reactions of intermediate products, which produce many impurities and bring great difficulties to subsequent rectification. These byproducts include 2-methyl-BDO, 1,-pentanediol, methanol, n-butanol, G-hydroxy-butanol, etc., in which the impurity content of 2-methyl-BDO and 1,4-pentanediol is the product 1,4-butanediol is used in An important indicator in the high-end field; the main reason for the increase in side reactions is that the catalyst activity temperature range is small and the selectivity is poor; the traditional process route usually uses frequent replacement of catalysts to improve the purity of 1,4-butanediol products and reduce the content of impurities ; This not only caused the waste of the catalyst, but also greatly increased the production cost, and also caused some pollution to the environment

(2) The rectification process of BDO is mainly to separate the crude BDO, water and low-boiling point organic matter generated in the hydrogenation reaction, and the impurities in the crude product 1,4-butanediol will form an azeotrope with BDO, which is in the azeotrope Boiling substances are difficult to achieve effective separation in actual production

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