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Method and system for preparing 1, 4-butanediol and co-producing 1, 4-butenediol through hydrogenation of 1, 4-butynediol

A technology of butynediol and butenediol, applied in the field of hydrogenation of 1,4-butynediol, which can solve the problems of large power consumption, increased cost, and low selectivity of 1,4-butenediol , to achieve the effect of large operation flexibility, wide application range and full utilization

Pending Publication Date: 2022-03-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrogenation pressure in the second stage fixed bed is between 13.7MPa and 21.64MPa, which makes the hydrogenation pressure in the second stage too high and the power consumption too large
[0006] These use high-pressure reaction process, the selectivity of intermediate product 1,4-butenediol is very low, for example, in the two-step process mentioned in BE745225, the selectivity of 1,4-butenediol is below 5%
In the known low-pressure hydrogenation process, due to the poor selectivity of Raney Ni, there are a large amount of butanediol acetal product condensation polyaldehyde and butylene glycol isomerization product hydroxybutyraldehyde, the existence of these by-products greatly affects The purity of 1,4-butanediol requires multiple refining and separation processes to remove these impurities, which increases the cost of industrial production

Method used

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  • Method and system for preparing 1, 4-butanediol and co-producing 1, 4-butenediol through hydrogenation of 1, 4-butynediol
  • Method and system for preparing 1, 4-butanediol and co-producing 1, 4-butenediol through hydrogenation of 1, 4-butynediol

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Embodiment 1

[0072] Using the disclosed system to hydrogenate 1,4-butynediol aqueous solution to prepare 1,4-butanediol and co-produce 1,4-butenediol, the process flow is as follows figure 1 As shown, it consists of a fluidized bed reactor 1 and a fixed bed reactor 2 two-stage hydrogenation process.

[0073] The 1,4-butynediol aqueous solution with a concentration of 35% by weight and a pH of 11 enters the tube-side membrane tube assembly 3 through the liquid inlet at the bottom of the gas-liquid mixer, and the estimated hydrogen gas passes through the gas on the gas-liquid mixer shell. The inlet enters the shell side, and the hydrogen gas is dispersed into microbubbles through the micropores on the membrane tube wall with an average pore size of 3.0 μm, and is fully mixed with the 1,4-butynediol aqueous solution in the tube side of the gas-liquid mixer to obtain a mixed reactant , where the pressure difference on both sides of the membrane hole of the membrane tube assembly 3 is 0.1Mpa, a...

Embodiment 2

[0077] The method of Example 1 is used to hydrogenate the 1,4-butynediol aqueous solution to prepare 1,4-butanediol and co-produce 1,4-butenediol, the only difference is:

[0078] The parameters of the hydrogenation reaction are: (1) the temperature of the primary hydrogenation reaction is 50°C, and the hydrogenation pressure is 2.0MPa; the temperature of the secondary hydrogenation reaction is 100°C, and the hydrogenation pressure is 4.0MPa; , the gravimetric space velocity of 4-butynediol aqueous solution is 10h -1 , the weight space velocity of the first hydrogenation reaction product in the secondary hydrogenation reactor is 5.0h -1 (3) The gas velocity of replenishing hydrogen in the secondary reactor is 0.20m / s.

Embodiment 3

[0080] The method of Example 1 is used to hydrogenate 1,4-butynediol aqueous solution to prepare 1,4-butanediol and co-produce 1,4-butenediol, the only difference is: fluidized bed reactor 1 Catalyst is Ni 91.0 Al 9.0 , the catalyst in the fixed bed reactor 2 is Pd / Al with a Pd loading of 1.0% by weight 2 o 3 .

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Abstract

The invention relates to a method and a system for preparing 1, 4-butanediol and co-producing 1, 4-butylene glycol through hydrogenation of 1, 4-butynediol. According to the invention, hydrogen is dispersed and dissolved in 1, 4-butynediol by using the membrane tube assembly with a certain aperture, large-scale and continuous production of 1, 4-butynediol hydrogenation is realized by adopting a mode of connecting the fluidized bed reactor and the fixed bed reactor in series, and meanwhile, high-purity 1, 4-butylene glycol is co-produced; 1, 4-butylene glycol is separated from the first hydrogenation product in the fluidized bed reactor and then enters the fixed bed reactor for the second hydrogenation reaction, so that the first hydrogenation product is fully utilized, the operation flexibility is high, and the application range is wide.

Description

technical field [0001] The present disclosure relates to the field of hydrogenation of 1,4-butynediol, in particular, to a method of hydrogenating 1,4-butynediol to prepare 1,4-butanediol and co-producing 1,4-butenediol methods and systems. Background technique [0002] 1,4-Butanediol (BDO) is used in the production of polybutylene terephthalate (PBT), tetrahydrofuran (THF), γ-butyrolactone (GBL), polytetramethylene glycol ( General chemicals such as PTMEG) and polyurethane (PU), can also be used as intermediates in the production of pharmaceuticals and pesticides, as solvents, coating resins, wetting agents, softeners, chain extenders and crosslinking agents, etc. At present, industrially 1,4-butanediol is mainly prepared by hydrogenation of 1,4-butynediol, ie the Reppe method. The intermediate product of this process, 1,4-butenediol (BED), is also an important organic raw material, mainly used as an intermediate for medicine (vitamin B6), herbicide (endosulfan) and furan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/17C07C33/035C07C31/20B01J8/02B01J8/24
CPCC07C29/17C07C29/172B01J8/02B01J8/24C07C33/035C07C31/207
Inventor 张晓昕王宣宗保宁
Owner CHINA PETROLEUM & CHEM CORP
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