Method for preparing 1,3-methyl glycol by catalytic hydrogenation of 3-hydroxy propanal

A technology of hydroxypropionaldehyde catalysis and hydroxypropionaldehyde, which is applied in the preparation of hydroxyl compounds, chemical instruments and methods, and the preparation of organic compounds, can solve the problems of high reaction temperature and poor catalyst stability, and achieve low reaction temperature and high stability. Good, high reactivity and selectivity

Active Publication Date: 2007-09-26
SHANGHAI HUAYI NEW MATERIAL
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Problems solved by technology

However, due to the high reaction temperature in the second stage, the catalyst stability is poor

Method used

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Embodiment 1～18

[0016] Preparation of catalyst: The catalyst is prepared by impregnation-reduction method. First, impregnate the solution of the compound containing X and M components on the carrier, dry it at 120°C, and add the solution containing KBH 4 or NaH 2 PO 2 solution reduction. The reduced catalyst was repeatedly washed with distilled water until neutral, and stored in water for future use. The composition and content of catalyst in each embodiment are listed in Table 1.

[0017] Catalyst hydrogenation performance evaluation: A two-stage fixed-bed reaction process was adopted. 100g of the first-stage catalyst is loaded, and 40g of the second-stage catalyst is loaded. Pass the preheated raw material 3-hydroxypropionaldehyde aqueous solution and hydrogen into the first-stage reactor, and maintain a constant hydrogen pressure for hydrogenation reaction; the material at the outlet of the first-stage reactor is sent to the second-stage reactor after preheating, keeping A constant h...

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Abstract

The invention discloses a making method of 1, 3-propylene glycol through hydrogenating 3-hydroxy propanal, which comprises the following steps: adopting load-typed non-crystal alloy as catalyst; using two-segment paralleling fixing bid to hydrogenate continuously under 20-60 deg.c for one-segment and 50-90 deg.c for two-segment; setting the condensing density of 3-hydroxy propanal to 2.0-40.0% with air speed at 0.1-5.0h-1; making the hydrogen pressure at 0.5-10.0Mpa and air speed at 100-2000h-1.

Description

technical field [0001] The invention relates to a method for preparing 1,3-propanediol by two-stage catalytic hydrogenation of 3-hydroxypropionaldehyde, specifically, it refers to a continuous reaction process of 3-hydroxypropionaldehyde aqueous solution through a fixed-bed two-stage series hydrogenation and adopts A method for preparing 1,3-propanediol with a supported amorphous alloy catalyst. Background technique [0002] 1,3-Propanediol is an important organic chemical raw material, which is widely used in the synthesis of plasticizers, detergents, preservatives, emulsifiers, polyesters and polyurethanes, and can also be used as antifreeze, solvents, protective agents, etc. One of the most important applications is the preparation of poly(trimethylene terephthalate) (PPT) polyester fibers. PPT is a polyester material with excellent performance, which combines the high performance of polyethylene terephthalate (PET) and the ease of processing of polybutylene terephthalat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/141B01J23/755B01J23/888B01J23/83B01J27/19
Inventor 焦昆宁春利唐勇张春雷邵敬铭
Owner SHANGHAI HUAYI NEW MATERIAL
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