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Raw material gas purification method for propionaldehyde production

A raw material gas and propionaldehyde technology, applied in chemical instruments and methods, separation methods, adsorption purification/separation, etc., can solve the problems of high energy consumption, complicated separation of pretreatment and absorption liquid, sensitivity to impurities, etc., and achieve low energy consumption Effect

Inactive Publication Date: 2006-07-19
XINJIANG XINFENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The two are sensitive to impurities in raw materials, prone to disproportionation reactions, and the separation of pretreatment and absorption liquid is complicated
The adsorption pressure is generally 2MPa-6MPa, the adsorption temperature is -20°C to 15°C, the desorption pressure is 0.2MPa to 2MPa, the desorption temperature is 4-10°C, and the product ethylene purity is 56%-81%. The disadvantages are The purity of ethylene obtained by this process is low, which limits its application
[0009] However, due to the high energy consumption, low separation efficiency, and high content of impurities such as sulfur in the purified ethylene, the above separation method cannot be adapted to the requirements for raw materials such as propionaldehyde.

Method used

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  • Raw material gas purification method for propionaldehyde production
  • Raw material gas purification method for propionaldehyde production

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Embodiment 1, the raw material gas extraction and purification method required for the production of propionaldehyde is carried out according to the following steps: the first step, firstly carry out the conventional water washing and purification section to the synthesis gas, secondly carry out the conventional methanol washing and purification section, and then carry out the conventional Water washing and purification section; the second step, firstly, the heavy catalyzed dry gas is passed through the first series of pressure swing adsorption sections to remove some impurities to obtain PSA semi-finished gas, and then the PSA semi-finished gas is desulfurized through the conventional hydrogen sulfide removal section, and then The PSA product gas, ethylene gas, is obtained through adsorption in the second series of pressure swing adsorption sections; wherein: in the first series of pressure swing adsorption sections, the adsorbents used include activated carbon and alumi...

Embodiment 2

[0044] Embodiment 2 is different from Embodiment 1 in that: the top of the adsorbent in the first series of pressure swing adsorption sections or / and the second series of pressure swing adsorption sections is filled with counterweights, and the counterweights can be molecular sieves or porcelain Balls, so as to effectively reduce the pulverization of the adsorbent.

Embodiment 3

[0045] Example 3, the difference from Example 1 and Example 2 is that the dry gas of the refinery is first desulfurized by the conventional hydrogen sulfide removal section of the feed gas, and then part of the impurities are removed by the first series of pressure swing adsorption sections, which is beneficial to Desulfurization is especially suitable for the raw material of refinery dry gas with high sulfur content, and it can also effectively prevent sulfur poisoning in subsequent sections.

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Abstract

The invention provides a raw material gas purification method for propionaldehyde production comprising the steps of, (1) water scrubbing, methanol washing, and water scrubbing, (2) removing part of the impurity substance, desulfurizing, obtaining ethylene gas through pressure swing adsorption, (3) pressurizing the product ethylene gas through a compressor, catalyzing through hydrolyst, removing hydrogen sulfide, deoxidizing, (4) mixing the synthetic gas with ethylene, removing chlorine and desulfurizing.

Description

1. Technical field: [0001] The invention relates to a method for purifying ethylene of raw material gas required for propionaldehyde, namely oil refinery dry gas and fertilizer synthesis gas, and is a method for purifying raw material gas required for producing propionaldehyde. Background technique: [0002] At present, the traditional synthesis gas purification process is ① removing ammonia and carbon black in the conventional water washing purification section; ② using activated carbon with a particle size of 5-10 mesh to remove carbonyl iron and nickel carbonyl. But oxygen must be added first, so that the metal carbonyl compound reacts with oxygen to form iron oxide, nickel oxide and carbon dioxide, and the metal carbonyl compound is adsorbed on the surface of the activated carbon. ③Conventional deoxidation section uses palladium catalyst to remove unreacted trace oxygen in the previous stage; ④Conventional dechlorination section; Iron, nickel carbonyl and other componen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/00C07C7/12C07C11/04B01D53/053
Inventor 薛援李石新童祖基李新宋天龙经小平冯光韩广明张丽芸严智刚陈霆孙存生高斌马宏亮
Owner XINJIANG XINFENG