Detection reaction for epoxides

• US 20030017607A1
• Filed: 07/16/2002
• Published: 01/23/2003
• Est. Priority Date: 07/19/2001
• Status: Abandoned Application

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: Boll, Matthias
• Application Number:
  US10/197,047
• Publication Number:
  US 20030017607A1
• Time in Patent Office: Days
• US Class Current: 436/128
• CPC Class Codes: G01N 31/22 using chemical indicators G01N31/02 takes precedence
• CPC Class Codes: Y10T 436/200833 Carbonyl, ether, aldehyde or ketone containing
• CPC Class Codes: Y10T 436/21 Hydrocarbon
• CPC Class Codes: Y10T 436/25875 Gaseous sample or with change of physical state

Abstract

The present invention relates to a simple method for optical detection of the epoxide and/or aldehyde concentration in the waste gases of chemical reactions, particularly propene oxide and/or acrolein, for example, in the catalyzed partial oxidation of propene. The concentration of the epoxide/aldehyde may be estimated quantitatively by visual means by comparison with a standard or evaluated by digitalization of the image obtained on the detection plate. The detection medium employed in this method is a substrate to which an acid salt has been applied and, optionally, heat treated.

Claims

1. A method for detecting an epoxidized hydrocarbon and/or aldehyde comprising contacting a gas which could contain such epoxidized hydrocarbon and/or aldehyde with a detection medium produced by

a) applying an acid salt to a substrate, and

b) optionally, heat-treating the substrate from step a) at a temperature above 70°

C.

2. The method of claim 1 in which the detection medium is produced from a substrate which is a porous material.

3. The method of claim 2 in which the detection medium is produced with a hydrogen sulfate of an alkaline earth metal or an alkali metal.

4. The method of claim 1 in which the detection medium is produced with a hydrogen sulfate of an alkaline earth metal or an alkali metal.

5. The method of claim 1 in which the detection medium has been heat-treated at a temperature of from 70°

C. to 500°

C.

6. The method of claim 1 in which acrolein and/or propene oxide are the materials to be detected.