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Method and system for preparing 1,3-propylene glycol from glycerol

A technology of propylene glycol and glycerin, which is applied in the preparation of hydroxyl groups, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problems of low catalyst activity, high catalyst cost, low space-time yield, etc., achieve high selectivity, and reduce latent heat of vaporization. , the effect of improving solubility

Pending Publication Date: 2021-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of 1,3-propanediol by one-step hydrogenolysis of glycerol reported in literature and patents generally has problems such as low catalyst activity, low selectivity to 1,3-propanediol, low space-time yield, high catalyst cost, and poor stability.

Method used

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  • Method and system for preparing 1,3-propylene glycol from glycerol
  • Method and system for preparing 1,3-propylene glycol from glycerol
  • Method and system for preparing 1,3-propylene glycol from glycerol

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preparation example Construction

[0066] The method for preparing 1,3-propanediol of the present invention adopts aforementioned system to carry out, comprises the following steps:

[0067] S1, introducing the glycerin aqueous solution and hydrogen gas into the hydrogenation unit after mixing, and contacting the glycerin aqueous solution, hydrogen gas and catalyst under the reaction conditions, and reacting to form a hydrogenation mixed product containing 1,3-propanediol; and

[0068] S2, introducing the hydrogenated mixed product into a separation unit to separate 1,3-propanediol and by-products;

[0069] The concentration of the aqueous glycerin solution used in the present invention is 5-100% by weight. When the content reaches 100% by weight, the aqueous glycerin solution is pure glycerin, so the meaning of "aqueous glycerin solution" in the present invention includes pure glycerin. Preferably, the aqueous glycerin solution has a concentration of 7-98% by weight, more preferably 10-95% by weight.

[0070]...

preparation example 1

[0095] Add CH to 1.7g ammonium metatungstate 4 with H 2 The carbon-containing compound atmosphere with a volume ratio of 15:85 was set by the temperature program to raise the temperature to 800°C at a rate of 1°C / min, and then carbonized at a constant temperature for 6 hours, then switched to high-purity Ar gas, cooled to room temperature and kept at a constant temperature for 2 hours , then switched to O with an oxygen content of 0.2 vol% 2 with N 2 passivation treatment in a passivation atmosphere for 2 hours to obtain passivated tungsten carbide.

[0096] Put 5g of ammonium metatungstate in a muffle furnace and bake at 700°C for 3h to obtain tungsten oxide.

[0097] The passivated tungsten carbide and tungsten oxide were mixed at a weight ratio of 1:1, and ground for 2 hours in a high-purity Ar atmosphere in a planetary ball mill to obtain carrier Z1.

[0098] Dissolve 0.17 g of chloroplatinic acid solution with a platinum content of 2.375% by weight in 10 g of deionize...

preparation example 2

[0100] Add CH to 1.7g ammonium metatungstate 4 with H 2 The carbon-containing compound atmosphere with a volume ratio of 15:85 was set by the temperature program to raise the temperature to 800°C at a rate of 1°C / min, and then carbonized at a constant temperature for 6 hours, then switched to high-purity Ar gas, cooled to room temperature and kept at a constant temperature for 2 hours , then switched to O with an oxygen content of 0.2 vol% 2 with N 2 passivation treatment in a passivation atmosphere for 2 hours to obtain passivated tungsten carbide.

[0101] Put 5g of ammonium metatungstate in a muffle furnace and bake at 700°C for 3h to obtain tungsten oxide.

[0102] Mix the passivated tungsten carbide and tungsten oxide at a weight ratio of 1:2, and grind for 2 hours in a high-purity Ar atmosphere and a planetary ball mill to obtain the carrier Z2.

[0103] Dissolve 0.35 g of chloroplatinic acid solution with a platinum content of 2.375% by weight in 10 g of deionized w...

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Abstract

The invention provides a method and system for preparing 1,3-propylene glycol from glycerin; the method comprises the following steps: mixing a glycerin aqueous solution with hydrogen, introducing the obtained mixture into a hydrogenation unit, contacting the glycerin aqueous solution, hydrogen and a catalyst under reaction conditions, and carrying out a reaction to generate a hydrogenation mixed product containing 1,3-propylene glycol; and introducing the hydrogenated mixed product into a separation unit, and separating out 1, 3-propylene glycol and a by-product, wherein the catalyst comprises a carrier and an active component loaded on the carrier, the carrier comprises a carbide of a metal M and an oxide of the metal M, M is selected from a group VIB metal, and the active component is selected from one or more of metal components of a group VIII metal. According to the method, the specific catalyst is adopted in the selected system, the hydrogen and the glycerol pass through the process at one time, by means of the process, and the catalyst still keeps complete conversion of the glycerol at a high space velocity; meanwhile, the selectivity of the 1,3-propylene glycol is high, and industrial popularization is facilitated.

Description

technical field [0001] The invention relates to the technical field of organic chemical synthesis, in particular to a method and system for preparing 1,3-propanediol from glycerin. Background technique [0002] 1,3-propanediol (1,3-PDO) is an important organic chemical raw material, and its main use is the raw material of new polyester material poly(1,3-trimethylene terephthalate) (PTT). It is generally believed in the industry that PTT fiber will gradually replace polyester and nylon as a large-scale fiber in the 21st century, and has broad application prospects. In addition, the by-product glycerol in the biodiesel production process is seriously excessive, so it is of great significance to study the deep processing technology of glycerol. Therefore, the preparation of 1,3-propanediol from glycerol is widely considered as a transformation route with important application prospects. [0003] At present, the main methods for producing 1,3-propanediol from glycerol include ...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/60C07C29/74C07C29/80B01J27/22B01J37/02
CPCC07C29/60C07C29/74C07C29/80B01J27/22B01J37/0201C07C2527/22C07C31/205
Inventor 晋超吴玉王薇刘锋褚阳王轶凡秦康翟维明
Owner CHINA PETROLEUM & CHEM CORP
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