Preparation method of 1,4-butanediol composition
A technology of butanediol and its composition, which is applied in the field of 1,4-butanediol preparation, can solve the problems of no relevant instructions on the content of methyl butanediol, and no relevant instructions on operating conditions such as distillation, etc., and achieve wide industrial application Prospect, simple preparation process, and the effect of increasing investment
Inactive Publication Date: 2019-05-10
内蒙古东景生物环保科技有限公司 +1
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[0006] Chinese patent CN201610779852.4 discloses a method for hydrogenation of BYD to BDO. It mainly describes the two-stage hydrogenation process and catalyst type. There is no relevant description of the raw material description, distillation and other operating conditions, and there is no description of the methyl butanediol involved. describe
It can only be seen from it that at present, people have research and patent declarations on the catalyst research and hydrogenation process conditions of butynediol hydrogenation, but there is no control on how to control the formazan in 1,4-butanediol (BDO). There is no relevant statement on the content of butyl butanediol
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[0048] The 1,4-butynediol obtained by condensing acetylene and formaldehyde, the above process can refer to the existing process, the obtained crude product is sent to the formaldehyde circulation tower, and the top reflux temperature of the formaldehyde circulation tower is strictly controlled at 72-75 °C, the top pressure of the tower is controlled at 390-395KPaG, and the formaldehyde in the crude product is deeply removed; the formaldehyde content in the 1,4-butynediol aqueous solution after formaldehyde removal is found to be 0.09wt%-0.12wt%.
[0049] Subsequently, the above-mentioned 1,4-butynediol is adjusted by adding water and methanol to form a crude product (fine BYD) before hydrogenation, which is sent to such as figure 1 Hydrotreating is carried out in the schematic hydrogenation reaction system; figure 1 As shown, the hydrogenation reactor of the hydrogenation reaction system is composed of a main reactor and a secondary reactor, both of which are vertical solid b...
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The invention discloses a preparation method of a 1,4-butanediol composition. The preparation method is an alkyne-aldehyde method in which the formaldehyde content of a 1,4-butynediol raw material used in a hydrogenation section is controlled not lower than 0.05% by weight. The preparation method has the advantages that the formaldehyde content of 1,4-butynediol used in the hydrogenation process of the 1,4-butynediol is strictly controlled, the butynediol content of a butynediol water solution and the formaldehyde content of the 1,4-butynediol raw material are respectively controlled in a specific range by water supplement and formaldehyde addition, the content of a characteristic impurity, namely methyl butanediol, in the obtained 1,4-butanediol composition is reduced to meet demands of downstream applications in a simple way and without increase of additional investment, energy consumption and material consumption, and accordingly, the performance of downstream products is improved.
Description
technical field [0001] The invention relates to the field of 1,4-butanediol preparation, in particular to a preparation method of a 1,4-butanediol composition. Background technique [0002] 1,4-Butanediol (BDO for short) is an important organic and fine chemical raw material, which is widely used in the fields of medicine, chemical industry, textile, papermaking, automobile and daily chemical industry. BDO can produce tetrahydrofuran (THF), polytetrahydrofuran ether (PTMG), polybutylene terephthalate (PBT), γ-butyrolactone (GBL), N-methylpyrrolidone and polyurethane resin (PUResin), Coatings and plasticizers, etc., as well as solvents and brighteners in the electroplating industry. For example, in "1,4-butanediol, tetrahydrofuran and its industrial derivatives" (by Bai Gengxin, Chemical Industry Press), its downstream is described in detail. [0003] Economically feasible BDO production processes mainly include alkyne aldehyde method (also known as Reppe method) using form...
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Login to View More IPC IPC(8): C07C29/42C07C29/90C07C31/20
Inventor 俞海明黄龙马民峰张宏伟周华
Owner 内蒙古东景生物环保科技有限公司