A post-processing method and post-processing device for a 3-methylthiopropionaldehyde reaction mixture

A technology of methionaldehyde reaction and methionaldehyde, which is applied in the field of preparation of chemical intermediates, can solve problems such as increased operational complexity, increased process control points, complex process routes, etc., and achieves a reduction in material loss rate, The effect of shortening the process route and increasing the rectification yield

Active Publication Date: 2018-06-22
SHANDONG XINHECHENG AMINO ACID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Light removal tower and weight removal tower, two rectification operations at the same time, more process control points, increased operational complexity, materials undergo repeated condensation and re-evaporation, and the energy consumption value is relatively large
[0008] (3) There are light removal towers and weight removal towers at the same time, the process route is complicated, and the equipment cost is high

Method used

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  • A post-processing method and post-processing device for a 3-methylthiopropionaldehyde reaction mixture
  • A post-processing method and post-processing device for a 3-methylthiopropionaldehyde reaction mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1 A 3-methylthiopropionaldehyde aftertreatment device

[0053] It mainly includes rectification tower A, tower top condenser C, tower top condensation receiving tank D, side line condenser E, side line condensation receiving tank F, and tower still reboiler G.

[0054] The internal structure of rectification tower A consists of two parts, including packing section and demister B equipment, wherein the upper end of rectification tower A is packing section, and the lower end is equipped with demister B; demister B is located below the packing section, and the tower still Boiler G discharges into the upper end of the inlet at the bottom of the column.

[0055] In the packing section, the packing can be random packing or structured packing, and the number of theoretical plates is 20-25;

[0056] In the packing section, the packing type is common packing, and the specific type is not limited;

[0057] Described demister B, adopts the one in general type such as wire ...

Embodiment 2

[0064] Embodiment 2 A kind of aftertreatment method of 3-methylthiopropanal

[0065] Include the following steps:

[0066] (1) Feed

[0067] The 3-methylmercaptopropionaldehyde reaction mixture 1 prepared from methylmercaptan and acrolein is fed to the 10th tray of rectification tower A. The mixture components mainly include 89% of 3-methylmercaptopropionaldehyde and 0.303% hydrogen sulfide. %, methyl mercaptan 0.648%, allyl alcohol 0.227%, acrolein 0.479%, acetic acid 0.288%, acetaldehyde 0.193%, methanol 0.026%, dimethyl benzylamine 0.086%, dimethyl sulfide 0.158%, dimethyl Disulfide 0.292%, allyl acrylate 0.069%, water 5.301%, acrolein polymer, 3-methylthiopropionaldehyde polymer and other impurities 2.93%.

[0068] The first polymerization inhibitor 10 is a saturated solution of hydroquinone in methanol, and the active ingredient of the polymerization inhibitor, hydroquinone, accounts for 0.001% of the total mass of the 3-methylthiopropionaldehyde reaction mixture 1, and...

Embodiment 3

[0077] Embodiment 3 A post-treatment method of 3-methylthiopropanal

[0078] Include the following steps:

[0079] (1) Feed

[0080] The 3-methylmercaptopropionaldehyde reaction mixture 1 prepared from methyl mercaptan and acrolein is fed to the 11th tray of rectification tower A, and the mixture components mainly include 91% of 3-methylthiopropionaldehyde and 0.103 hydrogen sulfide %, methyl mercaptan 0.448%, allyl alcohol 0.027%, acrolein 0.019%, acetic acid 0.188%, acetaldehyde 0.043%, methanol 0.126%, dimethyl benzylamine 0.016%, dimethyl sulfide 0.158%, dimethyl Disulfide 0.212%, allyl acrylate 0.029%, water 4.901%, acrolein polymer, 3-methylthiopropionaldehyde polymer and other impurities 2.73%.

[0081] The first polymerization inhibitor 10 is a water-saturated solution of hydroquinone, and the active ingredient of the polymerization inhibitor, hydroquinone, accounts for 0.005% of the total mass of the 3-methylthiopropionaldehyde reaction mixture 1, and is fed from th...

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Abstract

The invention provides a post-treatment method for a 3-methylthio-propylaldehyde reaction mixture. The post-treatment method comprises feeding, tower top discharging of a rectification tower, tower bottom discharging of the rectification tower and feeding of a polymerization inhibitor. The invention further provides a post-treatment device for the 3-methylthio-propylaldehyde reaction mixture; the device is characterized by comprising the rectification tower, a lateral line discharging hole and a polymerization inhibitor feeding hole; the inner structure of the rectification tower comprises a packing section and a de-foaming device; the packing section is located at the upper end of the rectification tower; the de-foaming device is located at the lower end of the rectification tower. The post-treatment process provided by the invention has the following beneficial effects that a rectification process of 3-methylthio-propylaldehyde is simplified and the cost of equipment is reduced; leftovers generated by product polymerization in a rectification process are reduced, the rectification yield is improved, the material loss is reduced, the yield of the product reaches 99.2 percent and the purity of the product is 99.9 percent; one-step rectification adopted so that the energy consumption is reduced and the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of preparation of chemical intermediates, and relates to a preparation method of 3-methylthiopropanal, in particular to a post-processing method and a post-processing device of a 3-methylthiopropanal reaction mixture. Background technique [0002] 3-Methylthiopropanal (hereinafter referred to as MMP) is a common spice and an important intermediate for the preparation of methionine hydroxy analogs and methionine and its salts. Methionine is an essential amino acid in animal feed compositions. Methionine hydroxy analogs and Salt is a source of methionine and is widely used as a methionine supplement in animal feed. [0003] At present, the preparation of 3-methylthiopropanal is mainly synthesized from acrolein and methyl mercaptan. The conventional industrial method is to introduce liquid or gaseous acrolein and liquid or gaseous methyl mercaptan into a reactor containing liquid phase MMP and weak acid salt or weak bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C323/22C07C319/28B01D3/14
CPCB01D3/14C07C319/28C07C323/22
Inventor 王志轩陈聪李松松沈丹
Owner SHANDONG XINHECHENG AMINO ACID
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