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Loop reactor for preparing 1, 3-propylene glycol and preparation method of 1, 3-propylene glycol

A loop reactor, propylene glycol technology, applied in the direction of chemical instruments and methods, elimination of hydroxyl groups, metal/metal oxide/metal hydroxide catalysts, etc., can solve the limited industrial application prospects, difficult glycerin selectivity, glycerin conversion Low efficiency and other problems, to achieve high catalyst utilization, improve catalytic efficiency and yield, and good catalytic effect

Inactive Publication Date: 2020-07-31
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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  • Loop reactor for preparing 1, 3-propylene glycol and preparation method of 1, 3-propylene glycol
  • Loop reactor for preparing 1, 3-propylene glycol and preparation method of 1, 3-propylene glycol
  • Loop reactor for preparing 1, 3-propylene glycol and preparation method of 1, 3-propylene glycol

Examples

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Effect test

Embodiment 1

[0048] In a 5L loop reactor (reactor volume 5L), add 3000g of 30wt% glycerol ethanol solution, and add the catalyst Pt / WO pre-reduced by hydrogen at 200°C for 2h 3 / SiO 2 The powder is 36g, that is, the relative ratio of the catalyst to the reactant glycerol is 4wt%. Catalyst preparation raw material SiO 2 The amount of powder added and the amount of ammonium tungstate solution added in WO 3 / SiO 2 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 / SiO 2 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 rate of 90m / s, ...

Embodiment 2

[0051] In a 5L loop reactor (reactor volume 5L), add 3000g of 30wt% glycerol ethanol solution, and add the catalyst Pt / WO pre-reduced by hydrogen at 200°C for 2h 3 / SiO 2 The powder is 36g, that is, the relative ratio of the catalyst to the reactant glycerol is 4wt%. Catalyst preparation raw material SiO 2 The amount of powder added and the amount of ammonium tungstate solution added in WO 3 / SiO 2 The mass ratio of 15:100 metering, H 2 PtCl 6 The amount of addition is based on the mass of element Pt in WO 3 / SiO 2 2.5% 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 the replacement loop six times to raise the temperature of the air in the reactor to the preset reaction temperature of 170°C (heating time is about 15min) ) immediately after filling with hydrogen to a reaction pressure of 3MPa, adjust the circul...

Embodiment 3

[0054] In a 5L loop reactor (reactor volume 5L), add 3000g of 30wt% glycerol ethanol solution, and add the catalyst Pt / WO pre-reduced by hydrogen at 200°C for 2h 3 / SiO 2 The powder is 36g, that is, the relative ratio of the catalyst to the reactant glycerol is 4wt%. Catalyst preparation raw material SiO 2 The amount of powder added and the amount of ammonium tungstate solution added in WO 3 / SiO 2 The mass ratio of 21:100 metering, H 2 PtCl 6 The amount of addition is based on the mass of element Pt in WO 3 / SiO 2 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 the replacement loop six times to raise the temperature of the air in the reactor to the preset reaction temperature of 170°C (heating time is about 15min) ) immediately after filling with hydrogen to a reaction pressure of 3MPa, adjust the circul...

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Abstract

The invention discloses a loop reactor for preparing 1, 3-propylene glycol and a preparation method of 1, 3-propylene glycol. According to the loop reactor, the ratio of an inlet section opening innerdiameter to a nozzle inner diameter to an air chamber closing opening inner diameter to a mixing section inner diameter to a diffusion section length is 38: (1.5-5): (2-8): (10-50): (600-1700), and the opening angle of the diffusion section is 8-45 degrees. The loop reactor is adopted to perform glycerol hydrogenation preparation, so that the utilization rate of the catalyst, the conversion rateof 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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IPC IPC(8): B01J8/08C07C31/20C07C29/60B01J23/652
CPCB01J8/085B01J8/087B01J8/082C07C29/60B01J23/6527B01J23/002B01J2208/00902B01J2208/00176B01J2208/00539C07C2523/652C07C31/205
Inventor 梅华朱林於德伟
Owner JIANGSU NUOMENG CHEM
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