# US 9,434,706 B2 · 1,4-butanediol-containing composition

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- Number: US 9,434,706 B2
- Document ID: US9434706B2
- Status: Granted
- Kind: B2
- Application number: 14/150,174
- Filed: 2014-01-08
- Published: 2014-07-03
- Granted: 2016-09-06
- Earliest claimed: 2011-07-08
- Assignees: Mitsubishi Chemical Corporation
- Applicants: Mitsubishi Chemical Corporation
- Inventors: Yusuke Izawa; Masaru Utsunomiya; Norikazu Konishi; Kouta Tanaka; Takayuki Suzuki; Shinichirou Matsuzono
- Web page: https://patentgrep.com/patent/US9434706B2

## CPC

- C07C 29/94: Use of additives, e.g. for stabilisation
- C07D 307/08: Preparation of tetrahydrofuran
- C08G 63/183: Terephthalic acids
- C08G 63/78: Preparation processes
- C08K 5/20: Carboxylic acid amides
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

A 1,4-butanediol (1,4BG)-containing composition having high thermal stability, and having a concentration of 1,4-butanediol of 99.00% by weight or more and not more than 99.99% by weight and 2-pyrrolidone or N-methylpyrrolidone in a concentration, as converted into a nitrogen atom, of from 1.0 to 25 ppm by weight.

## Claims

### Claim 1

A 1,4-butanediol-containing composition having a concentration of 1,4-butanediol of 99.00% by weight or more and not more than 99.99% by weight and containing 2-pyrrolidone or N-methylpyrrolidone in a concentration, as converted into a nitrogen atom, of from 1.0 to 25 ppm by weight, wherein the 1,4-butanediol-containing composition is used to produce tetrahydrofuran.

### Claim 2 (depends on 1)

The 1,4-butanediol-containing composition according to claim 1, which has a pH is 5.0 or more and not more than 7.9.

### Claim 3 (depends on 1)

The 1,4-butanediol-containing composition according to claim 1, which has a thermal stability as measured by the formation of tetrahydrofuran of not greater than about 2998 ppm by weight.