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1,4-butanediol composition

A composition, butanediol technology, applied in hydrogenation preparation, organic chemistry and other directions, can solve problems such as distillation and other operating conditions without relevant instructions, methyl butanediol content without relevant instructions, etc., and achieves broad industrial application prospects, The effect of improving product performance and simple preparation process

Inactive Publication Date: 2019-06-07
内蒙古东景生物环保科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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

Method used

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  • 1,4-butanediol composition

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preparation example Construction

[0022] The above-mentioned 1,4-butanediol composition is prepared by an alkyne aldehyde method, and in the alkyne aldehyde method, the formaldehyde content of the 1,4-butynediol raw material used in the hydrogenation section is controlled to be less than 0.05 wt%; Preferably, the formaldehyde content of the 1,4-butynediol raw material used is lower than 0.03wt%;

[0023] In the hydrogenation section, methanol is added to the 1,4-butynediol raw material so that the methanol content of the 1,4-butynediol raw material is 1.0 to 5.0 wt%; preferably, the Methanol is added to the 1,4-butynediol raw material so that the methanol content of the 1,4-butynediol raw material is 1.5 to 4.5 wt%; more preferably, the 1,4-butyne adding methanol to the diol raw material, so that the methanol content of the 1,4-butynediol raw material is 2.5-4.0 wt %;

[0024] In the hydrogenation section, add water to the 1,4-butynediol aqueous solution, adjust the amount of water added to control the 1,4-bu...

Embodiment

[0043] The invention provides a 1,4-butanediol composition, the preparation method of which adopts alkyne aldehyde method, comprising:

[0044] The 1,4-butynediol obtained by condensing acetylene and formaldehyde, the above process can refer to the existing process, and 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%.

[0045] 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 hydrog...

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Abstract

The present invention discloses a 1,4-butanediol composition. The composition least contains 99.5 wt% of 1,4-butanediol and 20-750 ppm (w / w) of methylbutanediol, and the methylbutanediol comprises 2-methyl-1,4-butanediol and 1-methyl-1,4-butanediol. The methylbutanediol content of the 1,4-butanediol composition of the invention is greatly lower than that of the 1,4-butanediol composition preparedby existing methods, so the 1,4-butanediol composition prepared in the invention can well meet the needs of various downstream applications, and product performances are improved.

Description

technical field [0001] The invention relates to the field of organic and fine chemical raw materials, in particular to 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 formaldehyde an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/17
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