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Method for separating and purifying 1, 3-propylene glycol

A technology for separation of propylene glycol and membrane, applied in the separation/purification of hydroxyl compounds, organic chemistry, etc., can solve the problems of low product yield, high cost, complicated operation, etc., and achieve high product yield, mild process conditions, and simple operation Effect

Active Publication Date: 2022-03-29
JIANGSU YANGNONG CHEM GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method utilizes the characteristics of aldehydes, adding reactants to convert them into macromolecular substances, but side reactions will also occur. Although the aldehyde content can be reduced, the yield of the product is low, and resin adsorption operation is required, which is complicated. ,higher cost

Method used

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  • Method for separating and purifying 1, 3-propylene glycol

Examples

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Embodiment 1

[0062] This embodiment provides a method for separating and purifying 1,3-propanediol, the process flow diagram of the method is as follows figure 1 shown, including the following steps:

[0063] (1) The 1,3-propanediol reaction solution is subjected to precision filtration and reverse osmosis membrane separation in sequence, the 1,3-propanediol reaction solution is obtained from acrolein through a hydration hydrogenation process, and the 1,3-propanediol reaction solution is The composition includes 10.9wt% of 1,3-propanediol, 50ppm of 3-hydroxypropanal, 80ppm of 3-hydroxymethyltetrahydropyran, 70ppm of 1,3-dioxane-2-ethanol, 4-hetero Oxypimellaldehyde 20ppm, 4-heterooxyheptanediol 0.8wt%, water 88.3wt%, wherein the nickel metal content is 75ppm, the turbidity is 10NTU, and the total aldehyde content is 28ppm; the precision filtration is carried out in a precision filter , the pore size of the precision filter is 450nm; the separation of the reverse osmosis membrane is carrie...

Embodiment 2

[0070] This embodiment provides a method for separating and purifying 1,3-propanediol, said method comprising the following steps:

[0071] (1) The 1,3-propanediol reaction solution is subjected to precision filtration and reverse osmosis membrane separation in sequence, the 1,3-propanediol reaction solution is obtained from acrolein through a hydration hydrogenation process, and the 1,3-propanediol reaction solution is The composition includes 10.9wt% of 1,3-propanediol, 50ppm of 3-hydroxypropanal, 80ppm of 3-hydroxymethyltetrahydropyran, 70ppm of 1,3-dioxane-2-ethanol, 4-hetero Oxypimellaldehyde 20ppm, 4-heterooxyheptanediol 0.8wt%, water 88.3wt%, wherein the nickel metal content is 75ppm, the turbidity is 10NTU, and the total aldehyde content is 28ppm; the precision filtration is carried out in a precision filter , the pore size of the precision filter is 100nm; the separation of the reverse osmosis membrane is carried out using a disc type reverse osmosis membrane element,...

Embodiment 3

[0078] This embodiment provides a method for separating and purifying 1,3-propanediol, said method comprising the following steps:

[0079] (1) The 1,3-propanediol reaction solution is subjected to precision filtration and reverse osmosis membrane separation in sequence, the 1,3-propanediol reaction solution is obtained from acrolein through a hydration hydrogenation process, and the 1,3-propanediol reaction solution is The composition includes 10.9wt% of 1,3-propanediol, 50ppm of 3-hydroxypropanal, 80ppm of 3-hydroxymethyltetrahydropyran, 70ppm of 1,3-dioxane-2-ethanol, 4-hetero Oxypimellaldehyde 20ppm, 4-heterooxyheptanediol 0.8wt%, water 88.3wt%, wherein the nickel metal content is 75ppm, the turbidity is 10NTU, and the total aldehyde content is 28ppm; the precision filtration is carried out in a precision filter , the pore size of the precision filter is 60nm; the separation of the reverse osmosis membrane is carried out using a disc type reverse osmosis membrane element, ...

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Abstract

The invention provides a method for separating and purifying 1, 3-propylene glycol, which comprises the following steps: sequentially carrying out precision filtration and reverse osmosis membrane separation on a 1, 3-propylene glycol reaction solution to obtain a membrane diluted solution; concentrating the obtained thin film solution, and carrying out light component removal treatment on the obtained concentrated solution to obtain a light component removed kettle material; and rectifying the light component removal kettle material to obtain a 1, 3-propylene glycol product. The method comprises the following steps: according to the composition of a 1, 3-propylene glycol reaction solution, intercepting by-products with relatively large molecular weight in the reaction solution by utilizing the separation characteristic of reverse osmosis, reducing the separation difficulty of the 1, 3-propylene glycol product, and further purifying through the operations of concentration, light component removal and rectification to obtain the high-purity 1, 3-propylene glycol product, the purity of which can reach 99.98 wt% or above, and the purity of which can reach 99.98 wt% or above. The total aldehyde content is below 10ppm, the product yield is high, and the waste liquid discharge is less; the method is simple to operate, mild in process condition, stable and reliable in treatment effect and easy to industrially implement.

Description

technical field [0001] The invention belongs to the technical field of chemical separation and relates to a method for separating and purifying 1,3-propanediol. Background technique [0002] As an important organic chemical raw material, 1,3-propanediol can be used in ink, paint, cosmetics, pharmaceuticals, antifreeze and other industries, especially as the main component for the production of poly(1,3-propylene terephthalate) (PTT). Raw materials; PTT as a fiber material not only has the characteristics of polyester fiber, but also has good resilience and anti-pollution properties of nylon. It is widely used in carpets, engineering plastics, clothing fabrics and other fields, and is currently a hot spot in the development of synthetic fibers. [0003] Because the quality of 1,3-propanediol product has a great influence on the characteristics of PTT fiber, for example, the product purity will affect its intrinsic viscosity, and the aldehyde content and color of the product w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/76C07C31/20
CPCC07C29/76C07C31/205
Inventor 杨树斌徐林黄杰军丁克鸿王丹徐高明王再飞王建昌王怡明顾峰杨丽芬
Owner JIANGSU YANGNONG CHEM GROUP