Method for preparing 1, 3-propylene glycol from glycerin

A technology of propylene glycol and glycerin, applied in the direction of elimination of hydroxyl groups, chemical instruments and methods, feeding devices, etc., can solve the problems of limited industrial application prospects, difficult glycerin selectivity, low conversion rate of glycerin, etc., to improve catalytic efficiency and The effect of improving productivity, improving mixing efficiency, and reducing production cost

Inactive Publication Date: 2020-06-26
JIANGSU NUOMENG CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Higher catalyst activity, longer reaction time (or increased temperature and pressure), will promote the depth of hydrogenation reaction to obtain n-propanol (or isopropanol), reduce the selectivity of 1,3-propanediol, and the catalyst activity is weak, The short reaction time leads to low conversion rate of glycerol, so it is difficult to take into account the conversion of glycerol and the selectivity of the main product at the same time, which limits the prospect of industrial application

Method used

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  • Method for preparing 1, 3-propylene glycol from glycerin
  • Method for preparing 1, 3-propylene glycol from glycerin
  • Method for preparing 1, 3-propylene glycol from glycerin

Examples

Experimental program
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Embodiment 1

[0050] In a 5L loop reactor (reactor volume 5L), add 3000g of 30wt% glycerol methanol solution, add the catalyst Pt / WO pre-reduced by hydrogen at 200°C for 2h 3 / Al 2 o 3 The powder is 36g, that is, the relative ratio of the catalyst to the reactant glycerol is 4wt%. Catalyst preparation raw material Al 2 o 3 The amount of powder added and the amount of ammonium tungstate solution added in WO 3 / Al 2 o 3 The mass ratio of 8:100 metering, H 2 PtCl 6 The amount of addition is based on the mass of element Pt in WO 3 / Al 2 o 3 3% metering of sample mass. Introduce hydrogen into the reactor through the air inlet to a system pressure of 1 MPa, turn on the circulation pump to allow the liquid in the kettle to flow slowly, vent, and repeat six times to replace the air in the loop reactor to a preset reaction temperature of 170°C (heating time is about 15min) ) immediately after filling with hydrogen to a reaction pressure of 3MPa, adjust the circulation pump 4 to a flow ra...

Embodiment 2

[0053] In a 5L loop reactor (reactor volume 5L), add 3000g of 30wt% glycerol methanol solution, add the catalyst Pt / WO pre-reduced by hydrogen at 200°C for 2h 3 / Al 2 o 3 The powder is 36g, that is, the relative ratio of the catalyst to the reactant glycerol is 4wt%. Catalyst preparation raw material Al 2 o 3 The amount of powder added and the amount of ammonium tungstate solution added in WO 3 / Al 2 o 3 The mass ratio of 18:100 metering, H 2 PtCl 6 The amount of addition is based on the mass of element Pt in WO 3 / Al 2 o 3 1.5% metering of sample mass. Introduce hydrogen into the reactor through the air inlet to a system pressure of 1 MPa, turn on the circulation pump to allow the liquid in the kettle to flow slowly, vent, and repeat six times to replace the air in the loop reactor to a preset reaction temperature of 170°C (heating time is about 15min) ) immediately after filling with hydrogen to a reaction pressure of 3MPa, adjust the circulation pump 4 to a flow ...

Embodiment 3

[0056] In a 5L loop reactor (reactor volume 5L), add 3000g of 30wt% glycerol methanol solution, add the catalyst Pt / WO pre-reduced by hydrogen at 200°C for 2h 3 / Al 2 o 3 The powder is 36g, that is, the relative ratio of the catalyst to the reactant glycerol is 4wt%. Al in raw materials for catalyst preparation 2 o 3 The amount of powder added and the amount of ammonium tungstate solution added in WO 3 / Al 2 o 3 The mass ratio of 28:100 metering, H 2 PtCl 6 The amount of addition is based on the mass of element Pt in WO 3 / Al 2 o 3 1.5% metering of sample mass. Introduce hydrogen into the reactor through the air inlet to a system pressure of 1 MPa, turn on the circulation pump to allow the liquid in the kettle to flow slowly, vent, and repeat six times to replace the air in the loop reactor to a preset reaction temperature of 170°C (heating time is about 15min) ) immediately after filling with hydrogen to a reaction pressure of 3MPa, adjust the circulation pump 4 t...

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Abstract

The invention discloses a method for preparing 1, 3-propylene glycol by taking glycerin as a raw material and adopting a loop reactor. According to the method, 1, 3-propylene glycol is prepared by taking glycerin as the raw material and Pt / WO3 / Al2O3 as a catalyst through hydrogenation reaction in the loop reactor. The loop reactor is adopted, the powdery Pt / WO3 / Al2O3 serves as the catalyst, glycerin hydrogenation preparation is conducted, and the utilization rate of the catalyst, so that the conversion rate of reactants and the selectivity of the target product 1, 3-propylene glycol are improved.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a method for preparing 1,3-propanediol by adopting a new type of reactor equipment—a loop reactor to carry out a batch process of hydrogenation of glycerol. Background technique [0002] 1,3-Propanediol is an important high value-added organic chemical raw material, which is widely used in ink, paint, cosmetics, pharmaceuticals, antifreeze and other chemical industries. Its most important use is as a polymer monomer to synthesize polymer materials with excellent performance, such as the new polyester fiber PTT (polypropylene terephthalate) with excellent performance. [0003] As a renewable resource, glycerol can produce high value-added 1,3-propanediol through a series of chemical or biological changes. In US Pat. No. 5,426,249, a 10-40 wt% glycerol aqueous solution is used to dehydrate glycerin through an acidic solid catalyst at a temperature of 250-34...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/60C07C31/20B01J23/652B01J8/14B01J4/00
CPCC07C29/60B01J23/6527B01J23/002B01J8/0035B01J8/085B01J8/14Y02P20/52
Inventor 梅华高传林焦宏伟汪国辉
Owner JIANGSU NUOMENG CHEM
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