Preparation method for co-production of 2-methyl-1, 3-propylene glycol and pentaerythritol

A technology of pentaerythritol and propylene glycol, which is applied in the field of co-production of 2-methyl-1,3-propanediol and pentaerythritol, can solve the problems of large amount of waste water and low added value of by-products, achieve simple process flow and avoid large output , Improve the effect of economy

Active Publication Date: 2021-12-28
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The object of the present invention is to provide a kind of preparation method of co-production 2-methyl-1,3-propanediol and pentaerythritol, specifically provide a kind of by changing cata...

Method used

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  • Preparation method for co-production of 2-methyl-1, 3-propylene glycol and pentaerythritol
  • Preparation method for co-production of 2-methyl-1, 3-propylene glycol and pentaerythritol
  • Preparation method for co-production of 2-methyl-1, 3-propylene glycol and pentaerythritol

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Embodiment 1

[0062] 37% aqueous formaldehyde solution (stream 1), acetaldehyde (stream 2), triethylamine (stream 3), and auxiliary agent (stream 4) are added to the condensation reaction in a molar ratio of 3:1:0.05:0.003 In the reactor R101, the molar amount of formaldehyde is based on the molar content of formaldehyde in the aqueous formaldehyde solution. At the same time, the top material (stream 6) of the condensation raw material recovery tower also enters the condensation reactor R101 for reaction. The reaction temperature is 80°C and the reaction pressure is 0.8 MPaA, residence time 0.5h. The condensation reaction solution (stream 7) generated after the reaction enters the condensation raw material recovery tower C101, the pressure of the condensation raw material recovery tower is 0.2MPaA, the theoretical plate number is 20 plates, the feeding position is 10 plates, and the reflux ratio is 2. The unreacted formaldehyde and part of the water (stream 6) obtained from the top of the t...

Embodiment 2

[0071] The molar ratio of 37% formaldehyde solution (stream 1), acetaldehyde (stream 2), trimethylamine (stream 3), additive (stream 4), and water (stream 5) is 10:1:0.02 :0.005:5 is added in the condensation reactor R101, wherein the molar weight of formaldehyde is based on the formaldehyde molar content in the formaldehyde aqueous solution, and the condensation raw material recovery tower top material (stream 6) also enters the reaction in the condensation reactor R101 simultaneously, The reaction temperature is 20°C, the reaction pressure is 0.2MPaA, and the residence time is 1h. The condensation reaction liquid (stream 7) generated after the reaction enters the condensation raw material recovery tower C101, the pressure of the condensation raw material recovery tower is 0.6MPaA, the number of theoretical plates is 30 plates, the feeding position is 20 plates, and the reflux ratio is 0.1. The unreacted formaldehyde and part of the water (stream 6) obtained from the top of t...

Embodiment 3

[0080] 37% formaldehyde solution (stream 1), acetaldehyde (stream 2), trimethylamine (stream 3), additives (stream 4), water (stream 5) in a molar ratio of 5:1:0.01 :0.01:10 is added in the condensation reactor R101, wherein the molar weight of formaldehyde is based on the formaldehyde molar content in the formaldehyde aqueous solution, and the condensation raw material recovery tower top material (stream 6) also enters the reaction in the condensation reactor R101 simultaneously, The reaction temperature is 50°C, the reaction pressure is 0.4MPaA, and the residence time is 2h. The condensation reaction liquid (stream 7) generated after the reaction enters the condensation raw material recovery tower C101, the pressure of the condensation raw material recovery tower is 0.5MPaA, the theoretical plate number is 10 plates, the feeding position is 5 plates, and the reflux ratio is 10. The unreacted formaldehyde and part of the water (stream 6) obtained from the top of the tower are...

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Abstract

The invention provides a preparation method for co-production of 2-methyl-1, 3-propylene glycol and pentaerythritol. The method comprises the following steps: reacting formaldehyde with acetaldehyde under the action of tertiary amine and an auxiliary agent, and carrying out rectification separation on a reaction solution to obtain a condensation reaction solution containing 2-hydroxymethyl acrolein and tris (hydroxymethyl) acetaldehyde; catalyzing a condensation reaction liquid by a hydrogenation catalyst in a hydrogenation reactor, subjecting 2-hydroxymethyl acrolein to hydrogenation to generate 2-methyl-1, 3-propylene glycol, and subjecting tri (hydroxymethyl) acetaldehyde to hydrogenation to generate pentaerythritol. The method is a novel method for industrially producing the 2-methyl-1, 3-propylene glycol and the pentaerythritol, and the yield of the 2-methyl-1, 3-propylene glycol and the yield of the pentaerythritol can be flexibly adjusted; in addition, the pentaerythritol prepared by the method solves the problems of large wastewater amount and low added value of a byproduct formate in the production process of a disproportionation method, and greatly improves the utilization rate of formaldehyde and acetaldehyde.

Description

technical field [0001] The invention belongs to the field of organic synthesis, and in particular relates to a preparation method for coproducing 2-methyl-1,3-propanediol and pentaerythritol. Background technique [0002] 2-Methyl-1,3 propanediol (MPO) is an important organic synthesis intermediate with good antibacterial properties, hydration and biodegradability; a methyl group in the middle of MPO molecule determines its solvent phase Capacitance is better than other diols, and the methyl branch can effectively prevent the approach and overlap between polyester chains, so that the prepared polyester products have good chemical resistance and weather resistance, bending resistance and stretch resistance , non-crystalline and flexible, make the base branched, its stability is high and its strength is high; MPO is mainly used for synthetic leather slurry, polyurethane coating, polyurethane adhesive for composite food flexible packaging, etc. Pentaerythritol (PE) is a white ...

Claims

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Application Information

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IPC IPC(8): C07C29/17C07C29/141C07C31/20C07C29/78C07C31/24C07C29/80C07C45/75C07C47/263C07C47/19
CPCC07C29/175C07C29/141C07C31/20C07C29/78C07C31/245C07C29/80C07C45/75C07C47/263C07C47/19
Inventor 吕艳红王加琦张昊管兴龙陈弘陈来中
Owner WANHUA CHEM GRP CO LTD
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