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[Chemical Knowledge]：BDO and downstream manufacturing methods and processes.

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BDO(1,4-butanediol) is an important organic chemical raw material, which is widely used in plastics, fibers, adhesives, pharmaceuticals and other fields. This article will introduce the manufacturing methods of BDO and its downstream products.

1. BDO manufacturing method

1.
acetylene aldehyde method is acetylene and formaldehyde as raw materials, after addition, hydrolysis, oxidation, decarburization and other steps of BDO. The method is easy to obtain raw materials and easy to operate, but a large amount of formaldehyde wastewater will be produced in the production process, and the environmental protection pressure is high.

2. maleic anhydride method
maleic anhydride method is maleic anhydride as raw material, after hydrogenation, hydrolysis and other steps to produce BDO. The raw materials of this method are more expensive, but the waste water generated in the production process is less, and the environmental protection pressure is relatively small.

3. Butadiene method
BDO is obtained by butadiene as raw material through oxidation, hydrolysis and hydrogenation. The raw materials of this method are easy to obtain, but the production process requires high pressure and high temperature conditions, and the equipment investment is large.

2. BDO downstream product manufacturing method

1. PBT (polybutylene terephthalate)
PBT is an engineering plastic with excellent heat resistance, chemical resistance and electrical insulation. The manufacturing method of PBT is BDO and terephthalic acid as raw materials, through esterification, polycondensation and other steps.

2. PU (polyurethane)
PU is a polymer material with excellent elasticity, wear resistance, chemical resistance, etc. The manufacturing method of PU is to make polyester polyol with BDO and dibasic acid as raw materials, and then react with diisocyanate to make PU.

3. GBL (gamma-butyrolactone)
GBL is a solvent and organic synthesis intermediates, can be used to manufacture pesticides, pharmaceuticals, spices and so on. The manufacturing method of GBL is BDO as raw material, through the dehydrocyclization reaction.

4. NMP(N-methyl pyrrolidone)
NMP is a polar solvent and polymer synthetic monomer, which can be used in the manufacture of lithium batteries, capacitors, etc. The production method of NMP is based on BDO and methylamine as raw materials, through the addition, cyclization, dehydrogenation and other steps.

In conclusion, as an important organic chemical raw material, BDO has a wide range of applications in the field of chemical production raw materials. Different manufacturing methods have different advantages and disadvantages and scope of application, and need to be selected according to the specific situation. At the same time, the downstream products of BDO also have a wide range of application fields and development prospects, which can inject new impetus into the development of the chemical industry.

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