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Method for removing volatile substances in polyether polyol and reducing smell

A technology for polyether polyols and volatile substances, applied in the field of polyether polyols, can solve the problems of improving the removal effect of small molecular impurities, and achieve the effects of reducing odor, satisfying health, and reducing volatile components

Active Publication Date: 2017-03-29
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only adding a thin film evaporator can improve the removal effect of small molecular impurities to a limited extent.

Method used

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  • Method for removing volatile substances in polyether polyol and reducing smell
  • Method for removing volatile substances in polyether polyol and reducing smell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Add 40g of glycerin into the reaction kettle as a starter, KOH accounting for 0.5wt% of the total mass as a catalyst, after nitrogen replacement and dehydration, successively add 2100g of propylene oxide and 370g of epoxy at 100°C and no more than 0.5MPa. Ethane, after feeding and aging, a polyether polyol (referred to as polyether) with a functionality of 3 and a molecular weight of 5000 was obtained. Take 2000g of the above-mentioned polyether, add 0.3wt% phosphoric acid aqueous solution through the distributor at the bottom of the tank for neutralization, then add 0.5wt% magnesium silicate and 2wt% diatomaceous earth, heat up and vacuum dehydrate, while nitrogen bubbles, and finally add Press filter 2 times. Add 0.3% by mass fraction of pentaerythritol bisphosphite and 5ppm of sodium borohydride to the obtained refined polyether polyol. The polyether then enters the stripping tower, and the triangular cone packing is filled into the tower at intervals. The temperat...

Embodiment 2

[0046] Referring to the steps and conditions in Example 1, add 51g of sorbitol to the reactor as a starter, and KOH accounting for 0.5wt% of the total mass as a catalyst. Continuously add 2200g of propylene oxide and 245g of ethylene oxide in sequence, after feeding and aging, a polyether with a functionality of 6 and a molecular weight of 8000 is obtained. Take 2000g of the above polyether, add 0.5wt% oxalic acid for neutralization, then add 1wt% magnesium silicate and 1wt% diatomaceous earth for refining. Add 0.1% of pentaerythritol bisphosphite and 4ppm of sodium borohydride to the refined polyether. The operating temperature of the stripping tower is 130°C, the pressure is -0.07MPa, and the flow volume ratio of water vapor to polyether is 2. The operating temperature of the short path evaporator is 150°C and the vacuum degree is 0.3mbar. All the above contents are based on the mass of polyether, the same below.

Embodiment 3

[0048] With reference to the steps and conditions in Example 1, add 83g of propylene glycol as a starter to the reactor, and KOH accounting for 0.5wt% of the total mass as a catalyst. After nitrogen replacement and dehydration, continue at 100°C and no more than 0.5MPa 2400g of propylene oxide was added, and after feeding and aging, a polyether with a functionality of 2 and a molecular weight of 2000 was obtained. Take 2000 g of the above-mentioned polyether, add 0.8wt% acetic acid, 2wt% aluminum silicate and 0.5wt% acid clay for refining in sequence. Subsequently, 1% by mass fraction of 2,8-di-tert-butyl-4-methylphenol and 1 ppm of sodium thiosulfate were added to the polyether. The operating temperature of the stripper is 160°C, the pressure is -0.09MPa, and the flow volume ratio of water vapor to polyether is 0.5. The operating temperature of the short path evaporator is 160°C and the vacuum degree is 10mbar. All the above contents are based on the mass of polyether, the ...

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Abstract

The invention discloses a method for removing volatile substances in polyether polyol and reducing smell. The method comprises the following steps: adding an antioxidant and a reducing agent into polyether polyol, treating with a stripping tower and a short-range evaporator, and collecting a polyether polyol product. Through the use of both antioxidant and reducing agent, the antioxidant prevents oxidation of unsaturated bond in polyether, and the source for generating some aldehyde ketone volatile substances is cut; and moreover, the reducing agent can reduce the aldehyde ketone substances into alcohols, the hydrogen bond interaction between hydroxyls is obviously lower than a chemical bond, and thus the volatile substances are removed more easily.

Description

technical field [0001] The invention relates to a method for removing volatile substances in polyether polyols, which can significantly reduce the odor of polyether polyols and belongs to the field of polyether polyols. Background technique [0002] Polyether polyol is an important chemical raw material, which is widely used in industrial fields such as textile, shoemaking, synthetic leather, coating, adhesive, elastomer, foam plastic, sealant and petroleum development. main raw material. In the traditional polyether polyol production process, multi-step operations such as raw materials, side reactions, and post-treatment will lead to the formation of volatile substances, which are difficult to separate. Although the content of odorous substances is very small, it brings a strong unpleasant smell to polyether polyols. [0003] With the strengthening of people's awareness of environmental protection, the environmental protection requirements for daily necessities are also g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/30C08G18/48
CPCC08G18/48C08G65/30
Inventor 王竞辉鞠昌迅刘斌叶天张琴花李付国程英黎源华卫琦
Owner WANHUA CHEM GRP CO LTD
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