Method for preparing polyurethane foam from BDO byproduct and application of polyurethane foam

Abstract

The invention discloses a method for preparing polyurethane foam from BDO by-products and application of the polyurethane foam, and the method for preparing a polyether polyol and polyester mixture as the raw material of the polyurethane foam comprises the following steps: respectively separating moisture, BDO, organic salt and sodium hydroxide in organic waste liquid for producing BDO, and carrying out filter pressing at 60-120 DEG C under -0.085 to -0.095 MPa to separate insoluble substances and inorganic salt to obtaining the polyether polyol and polyester multi-component mixture. According to the method, the BDO waste liquid is fully recycled, polyether polyol (ester) used for producing the polyurethane foam material is stable in quality and low in cost, the method is an excellent substitute for synthesizing simple substance polyether and polyester materials from the polyurethane foam, the production process is simple, the production cost is low, the energy consumption is low, the production efficiency is high, and the quality is reliable.

Description

technical field [0001] The invention relates to the technical field of polyurethane foam, in particular to a method for preparing polyurethane foam from BDO by-products and its application. Background technique [0002] 1,4-Butanediol, also known as BDO, is a widely used fine chemical raw material. Since it was introduced from the United States to China in the early 21st century, its annual output has rapidly increased from tens of thousands of tons to millions of tons. The production methods of BDO include maleic anhydride method, alkyne aldehyde method, allyl alcohol method, etc., but the most commonly used method is alkyne aldehyde method. The process of producing BDO by the alkyne aldehyde method is to use acetylene to react with formaldehyde to generate 1,4-butynediol, and 1,4-butynediol is hydrogenated and saturated under high pressure to generate BDO. In this process, because the raw materials need to be purified with concentrated sulfuric acid and the buffer solutio...

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Problems solved by technology

Although the patent ZL201010568080.2 realizes the recovery and utilization of alcohols in BDO waste liquid, it obtains n-butanol products, and extracts the alcohols in the water-rich layer through the overhead distillate of the rectification tower and the water-rich layer. Fusel oil can be obtained by mixing with the overhead distillate of the rectification tower, and the water after alcohol extraction in the water-rich layer can be discharged directly, but in actual production, the use of fusel oil is not great, and the overhead distillate of the rectification tower The amount of the product is far greater than the amount of alcohol in the water-rich layer, so this method will leave a large amount of rectification tower overhead, although it is proposed in the method that the rectification tower overhead can be further processed Butanediol and tetrahydrofuran are prepared by rectification and purification, but an oily mixture will still be produced at the bottom of the tower. After testing, the oily mixture contains a large amount of sodium formate, sodium hydroxide and polyether polyol (ester). If it is discharged directly, it will be harmful to the The environment brings certain pollution, and it is also a waste of resources

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