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What is 1,4-butanediol?

Views: 288     Author: Vickey     Publish Time: 2023-06-19      Origin: Site

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What is 1,4-butanediol?

1,4-butanediol is an organic substance with the molecular formula C4H10O2 and a molecular weight of 90.12. Appearance is a colorless or pale yellow oily liquid.It also named 1,4-butyleneglycol; tetramethylene glycol; 1,4-butylene glycol; 75% 1,4-butanediol; butane-1,4-diol; butane-1,1-diol.

1,4-butanediol was flammable with a freezing point of 20.1 °C and a refractive index of 1.4461. 1,4-butanediol can be soluble in methanol, ethanol, and acetone; it is slightly soluble in ether; it is hygroscopic; it has a bitter smell; and its entrance is slightly sweet. 1,4-butanediol is used as a solvent and humidification agent, but also for plasticizers, drugs, polyester resin, polyurethane resin, etc.

Preparation method

The acetylene method

First made 1,4-butyrylene diol at 98 kPa, 80–95 °C, in the presence of Cu–Bi catalyst. The latter is catalyzed by 1.372-2.06 MPa nickel at 50–60 °C to form 1,4-butadiate and Ni-Cu-Mn/AAl2O3 at 13.7–20.6 MPa at 120–140 °C to form 1,4-butanediol. After removing metal ions by ion exchange resin, we purified the pure products by distillation.

Dinediene method

First, 1,4-butylenediol was made by reaction at 98 kPa and 80–95 °C in the presence of Cu–Bi catalyst. The latter is catalyzed by 1.372-2.06 MPa nickel at 50–60 °C to form 1,4-butadiate and Ni-Cu-Mn/AAl2O3 at 13.7–20.6 MPa at 120–140 °C to form 1,4-butanediol. After removing metal ions by ion exchange resin, we purified the pure products by distillation.

Applications

1,4 Butanediol, an important organic and fine chemical raw material, is the basic raw material of polyethylene (PBT) engineering plastics and PBT fiber. PBT plastic is one of the five most promising engineering plastics. 1,4 Butanediol is the main raw material for the production of tetrahydrofuran, and tetrahydrofuran is an important organic solvent.

Polytetramethylene glycol ether (PTMEG), obtained after polymerization, is the basic raw material for the production of high-elastic spandex (Leica fiber). Spandex is mainly used in the production of advanced sportswear, swimsuits, and other high-elastic knitwear.

1,4 The downstream product of butanediol (butanacol) is the raw material for the production of 2-pyrrolidone and N-methylpyrrolidone products, from which a series of high-value-added products such as vinyl pyrrolidone and polyvinylpyrrolidone are derived, which are widely used in the fields of pesticides, medicine, and cosmetics.

Storage and handling

1,4-butanediol is hygroscopic and will be degraded by oxygen, so the storage container should be sealed with dry nitrogen. It is recommended that storage be at 25–40 °C. Below 20℃ 1,4-butanediol will be solid but can be melted by careful heating. To melt solidified 1,4-butanediol in drums, hold them overnight at 50–70 °C.

1,4-butanediol is classified under the Japanese Fire Services Act as a hazardous material, Class 4, Petroleum No. 3, water-soluble, Hazardous Rank III. Volatility is low, and 1,4-butanediol is unlikely to catch fire by itself at room temperature. However, if it is burning, dry chemicals, foam (alcohol-resistant), or large amounts of water are effective. 1,4-butanediol has relatively low toxicity and is a relatively safe chemical. When handling, however, protective equipment such as gloves and goggles should be worn.

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