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[Chemical Knowledge]：Production method and process flow of sorbitol starting agent rigid foam polyether polyol

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1. of Manufacturing Method
of Sorbitol Starter Hard Foam Polyether Polyol Introduction

Sorbitol Starter Hard Foam Polyether Polyol is an important raw material for chemical production, which is widely used in polyurethane hard foam, thermal insulation materials, coatings and other fields. This paper will introduce the manufacturing method of sorbitol starter rigid foam polyether polyol, including raw material preparation, reaction process, post-treatment and other processes.

2. Raw Material Preparation

1. Sorbitol: As a starter, sorbitol has multiple hydroxyl groups and can react with raw materials such as ethylene oxide.
2. Ethylene oxide: As a polymerizable monomer, ethylene oxide can undergo a ring-opening polymerization reaction with sorbitol to produce polyether polyols.
3. Catalyst: A basic catalyst, such as potassium hydroxide or sodium hydroxide, is generally used to promote the progress of the ring-opening polymerization reaction.

3. reaction process

1. Pretreatment: Add sorbitol and catalyst to the reactor, heat to a certain temperature, so that the catalyst is dissolved and fully mixed with sorbitol.
2. Polymerization: Under the action of stirring, ethylene oxide is gradually added to cause ring-opening polymerization reaction with sorbitol. The temperature, pressure and feeding rate need to be controlled during the reaction to ensure the smooth progress of the reaction.
3. Post-treatment: After the reaction, the product is subjected to neutralization, washing, dehydration and other treatments to remove the catalyst and by-products.

4. influencing factors and control

1. Temperature: Temperature has a great influence on the speed of polymerization reaction and the molecular weight of the product. It is usually necessary to control the temperature within a certain range to obtain the desired product properties.
2. Pressure: Pressure mainly affects the boiling point of ethylene oxide and the reaction rate. The reaction needs to be carried out under appropriate pressure to ensure the smooth progress of the reaction.
3. Feeding rate: The feeding rate has a great influence on the molecular weight and molecular weight distribution of the product. The appropriate feed rate needs to be controlled to achieve the desired product properties.

5. post-treatment and product quality control

1. Neutralization: Use acidic substances to neutralize the residual alkaline catalyst to ensure the stability and performance of the product.
2. Washing: The product is washed with water to remove by-products and residual starting material.
3. Dehydration: Use vacuum drying or centrifugal dehydration to remove the water in the product to ensure the quality and storage stability of the product.

6. safety production and environmental protection requirements

1. safety production: in the production process, it is necessary to strictly abide by the safety operation procedures to ensure the normal operation of the equipment and avoid the occurrence of safety accidents.
2. Environmental protection requirements: The waste water, waste gas and other pollutants generated in the production process need to be treated to meet environmental protection standards and discharged to reduce the impact on the environment.

7. conclusion The manufacturing method of

sorbitol starter rigid foam polyether polyol involves the control of multiple processes and influencing factors, and it is necessary to strictly grasp the process parameters and operation points of each link to ensure the quality of the product and the safety and environmental protection of production. Through reasonable process design and operation control, the sorbitol starter rigid foam polyether polyol with excellent performance can be produced, which can provide high-quality raw materials for polyurethane rigid foam and other fields.

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