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Method for preparing 1,3-propylene glycol by 3-hydroxypropionaldehyde hydrogenation

A technology of hydroxypropionaldehyde and propylene glycol, which is applied to hydrogenation of 3-hydroxypropionaldehyde to produce 1, can solve the problems of easy poisoning of platinum, decrease in selectivity, increase in production cost, etc., and achieve mild hydrogenation conditions, improved activity, and reduced hydrogenation. The effect of production costs

Inactive Publication Date: 2003-07-09
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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Problems solved by technology

But its disadvantage is that the selectivity of 1,3-propanediol fluctuates greatly. When the conversion rate is low, the selectivity can reach 100%, but if the conversion rate increases, the selectivity will decrease obviously.
And Pt / TiO 2 The catalyst is an improvement of this catalyst, especially in terms of activity stability, but because platinum is easily poisoned, the requirements for the content of sulfur, phosphorus and arsenic in the reaction solution are extremely high, which will also cause a decrease in production costs. Increase

Method used

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Embodiment Construction

[0015] The present invention will be further described below by embodiment, in embodiment: [Embodiments 1 to 12]

[0016] Catalyst preparation:

[0017] The nickel nitrate and a water-soluble compound containing the catalyst-promoting component A are formulated into an aqueous solution according to a certain ratio, and then added into a catalyst carrier according to the ratio, and stirred evenly. When it reaches a certain viscosity, it is extruded into strips and then dried in the shade. In order to increase the strength of the catalyst and decompose the metal compound into oxides, it was calcined at 80°C, 300°C, and 700°C for 3 hours, 4 hours and 5 hours, respectively. After the roasting is completed, it is naturally lowered to room temperature, and put into a reduction reactor. When the hydrogen pressure is 0.2 MPa, the temperature is raised at 470 ° C for about 4 hours. The degree of reduction can be judged from the amount of water produced. After the reduction, it wa...

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Abstract

The method for preparing 1,3-propylene glycol by means of hydrogenation of 3-hydroxy-propionaldehyde is characterized by that the weight percentage concentration of raw material 3-hydroxy-propionaldehyde aqueous solution is 10-20%, in the presence of catalyst two-stage hydrogenation process can be adopted to obtain 1,3-propylene glycol, in which the first stage hydrogenation temp. is 25-60 deg.C, second stage hydrogenation temp. is 110-130 deg.C, hydrogen gas pressure of two-stage hydrogenation is 4.0-7.0 MPa, and its space velocity is 0.1-5 hr (-1), and the active component of the catalyst is Ni-A, in which A is any one of Cr, Zn, Mo or Fe, and its carrier is molecular sieve containing Al2O3 or SiO2 or containing both them simultaneously, and the weight percetnage content of the actigve component of the catalyst is 30-60%.

Description

technical field [0001] The invention relates to a method for preparing 1,3-propanediol by hydrogenation of 3-hydroxy propionaldehyde, the catalyst active component used contains Ni and Cr, Zn, Mo or Fe. Background technique [0002] 1,3-propanediol is a compound with a wide range of uses. In addition to being used in the production of polyurethane and cyclic compounds, it is also the main monomer of poly(1,3-trimethylene terephthalate) fibers. Polypropylene terephthalate fiber is a polyester variety with excellent performance. Although it has come out in the 1950s, because 1,3-propanediol cannot be industrialized, it makes polypropylene terephthalate 1,3-propylene glycol The development of ester fibers has been stagnant for many years. In recent years, with the success of industrial production of 1,3-propanediol, the development and application of poly(1,3-trimethylene terephthalate) fiber has attracted attention again. At present, the hydration of acrolein to 3-hydroxypro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/14C07C31/20
Inventor 徐泽辉郭世卓刘华婷瞿国华
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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