Patent · US Active

Method for processing hydrogen chloride from isocyanate preparation

US10307727B2 · kind B2 · utility

0Cited by

7References

5Claims

0Family size

Assignee

Covestro Deutschland AG · DE

Inventors

Ralph Weber · Rio de Janeiro, BR
Martin Ehrig · Leverkusen, DE
Johannes Leonhäuser · Bensberg, DE
Dirk Weiβenberg · Leverkusen, DE

Key dates

Filing date	May 27, 2015
Grant date	Jun 4, 2019
Priority date	—
Expiry date	May 27, 2035

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/20
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A method for processing hydrogen chloride from isocyanate preparation comprises the steps: a) providing hydrogen chloride; b) purifying the hydrogen chloride provided; and furthermore step c) or step d): c) bringing the purified hydrogen chloride into contact with water and/or with hydrochloric acid which is not saturated with respect to uptake of hydrogen chloride, d) further processing the purified hydrogen chloride to chlorine by partial oxidation. The hydrogen chloride provided in step a) contains organic and/or nitrogen-containing impurities and in step b) the purification is carried out by bringing hydrogen chloride into contact with hydrochloric acid which is saturated to the extent of ≥90% with respect to uptake of hydrogen chloride at least in a first gas scrubber (10) and circulating this hydrochloric acid at least partially through the first gas scrubber (10).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.