Tetramethylene glycol hydrogenation

Butanediol. 1,4-Butanediol [110-63-4] tetramethylene glycol, 1,4-butylene glycol, was first prepared in 1890 by acid hydrolysis of N,]S3-dinitro-l,4-butanediamine (117). Other early preparations were by reduction of succinaldehyde (118) or succinic esters (119) and by saponification of the diacetate prepared from 1,4-dihalobutanes (120). Catalytic hydrogenation of butynediol, now the principal commercial route, was first described in 1910 (121). Other processes used for commercial manufacture are described in the section on Manufacture. Physical properties of butanediol are Hsted in Table 2. 

Butanediol, also known as tetramethylene glycol, is produced by the hydrogenation of butynediol (made from acetylene and formaldehyde). 

Chlorobutanes. Chlorobutanes can be obtained by diverse procedures, such as (1) the liquid-phase or thermal chlorination of butane, (2) addition of chlorine or hydrogen chloride to butenes, (3) reaction of hydrochloric acid with butanols and butylene glycols, (4) chlorination of chlorobutenes and chlorobutadienes, and (5) hydrochlorination of tetramethylene oxide (tetrahydrofuran) and butadiene. 

Hexamethylene diisocyanate 2.2.4- Trimethylhexamethylene diisocyanate Hydrogenated xylylene diisocyanate 1.4- Cyclohexane diisocyanate 4,4 -Dicyclohexylmethane diisocyanate Xylylene diisocyanate Tetramethylxylylene diisocyanate Tolulene diisocyanate Diphenylmethane diisocyanate Poly(ethylene glycol) Poly(propylene glycol) Poly(tetramethylene ether glycol) Poly(hexamethylene ether glycol) Poly(ethylene adipate) Poly(butylene adipate) Poly(neopentyl adipate) Poly(3-methylpentyl adipate) Poly(caprolactone) diol... 

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