Method for preparing sorbitol polyether polyol

A technology of sorbitol polyether and polyether polyol, which is applied in the directions of ether preparation, alkylene oxide preparation of ether, organic chemistry, etc. In order to improve the uniformity of mixing, improve fluidity, and improve product performance and color

Inactive Publication Date: 2012-08-01
南宁市化工研究设计院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the industrialization of sorbitol as a starting agent. The reason may be that almost all domestic sorbitol products are 70% aqueous solutions. Due to the high moisture content, it is difficult to be used as a starting agent.
The solid sorbitol and crystalline sorbitol that occurred then did not have a detailed report on using sorbitol as a polyether polyol initiator

Method used

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  • Method for preparing sorbitol polyether polyol
  • Method for preparing sorbitol polyether polyol
  • Method for preparing sorbitol polyether polyol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] （ The molar ratio of propylene oxide to crystalline sorbitol is 12:1)

[0037]Add 400g of crystalline sorbitol, 1550g of propylene oxide, 6.0g of catalyst and 4.0g of regulator into the reactor, cover and tighten the screws, then replace the air in the reactor with nitrogen for 3 times, remove the oxygen from the reactor, and then use nitrogen Pressurize to 0.15 Mpa, heat, start the stirring device, heat preservation reaction for 7 hours when the temperature rises to 95°C, and the reaction ends after the pressure drops to a constant value, turn on the cooling water to cool to room temperature, open the cover and discharge to obtain crude sorbitol polymer ether polyols.

[0038] Add phosphoric acid with a concentration of 10% to the crude sorbitol polyether polyol for neutralization reaction, neutralize to pH 7.0; heat, vacuumize and degas at 45~55°C, control the vacuum degree to 0.001 Mpa, degas for 60min ; and then in the state of stirring, add activated carbon to ca...

Embodiment 2

[0041] （ The molar ratio of propylene oxide to crystalline sorbitol is 15:1)

[0042] Add 1kg of crystalline sorbitol, 4.78kg of propylene oxide, 23g of catalyst and 23g of regulator into the reactor, cover and tighten the screws, then replace the air in the reactor with nitrogen for 4 times, remove the oxygen from the reactor, and then fill it with nitrogen. Press down to 0.15 Mpa, heat, start the stirring device, heat preservation reaction for 8 hours when the temperature rises to 95°C, and the reaction ends after the pressure drops to a constant value, turn on the cooling water to cool to room temperature, open the cover and discharge to obtain crude sorbitan polyether Polyol.

[0043] Add 99% solid oxalic acid to the crude sorbitol polyether polyol for neutralization reaction, neutralize to pH 7.1; heat, vacuumize and degas at 45~50°C, control the vacuum degree to 0.001 Mpa, degas for 80min ; and then in the state of stirring, add activated carbon to carry out the adsorp...

Embodiment 3

[0046] （ The molar ratio of propylene oxide to crystalline sorbitol is 13:1)

[0047] Add 800g of crystalline sorbitol, 3316g of propylene oxide, 14.5g of catalyst and 12.3g of regulator into the reactor, cover and tighten the screws, then replace the air in the reactor with nitrogen for 2 times, remove the oxygen from the reactor, and then use nitrogen Pressurize to 0.18Mpa, heat, start the stirring device, heat preservation reaction for 8 hours when the temperature rises to 90°C, the reaction ends after the pressure drops to a constant value, turn on the cooling water to cool to room temperature, open the cover and discharge to obtain crude sorbitol polymer ether polyols.

[0048] Add phosphoric acid with a concentration of 10% to the crude sorbitol polyether polyol for neutralization reaction, and neutralize to a pH value of 6.9; heat, vacuumize and degas at 50~55°C, control the vacuum degree to 0.001 Mpa, and degas for 40 minutes ; and then in the state of stirring, add ...

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Abstract

The invention discloses a method for preparing sorbitol polyether polyol. The finished sorbitol polyether polyol is prepared by performing polymerization reaction of sorbitolum and epoxypropane which serve as raw materials under the action of a catalyst and a regulator to obtain coarse sorbitol polyether polyol, performing neutralization reaction of the coarse sorbitol polyether polyol, degassing, adsorbing and performing vacuum suction filtration; and the catalyst is KOH or NaOH, and the regulator is glycol or glycerol. The sorbitolum with low cost is taken as an initiator, so the cost for the production of the sorbitol polyether polyol is correspondingly reduced; and moreover, the process is feasible, and the viscosity and a hydroxyl value of a sorbitol polyether polyol product meet the requirements of the product.

Description

technical field [0001] The invention belongs to the technical field of polyether polyol processing, and in particular relates to a preparation method of sorbitol polyether polyol. Background technique [0002] Polyether polyol is one of the two raw materials for polyurethane foam. There are many kinds of polyether polyols, including propylene oxide graft copolymerization polyols grafted and copolymerized with propylene oxide ether polyols from olefin monomers to improve the resilience and bearing capacity of soft and semi-rigid polyurethane foams; In order to improve the primary hydroxyl content and reactivity of propylene oxide homopolymer, ethylene oxide chain segments are introduced to form propylene oxide-ethylene oxide copolyol compounds, and elements such as phosphorus and silicon are introduced into polyether polyols. In the main chain of alcohol, organic propylene oxide polyether alcohol is an element that improves the flame resistance and heat resistance of foam pl...

Claims

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Application Information

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IPC IPC(8): C08G65/28C07C43/13C07C41/03
Inventor 贺均林王建平何丽萍章朝晖李宁韦炳前韦春艳
Owner 南宁市化工研究设计院
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