US 8,013,130 B2 · Carbon-based solid acid, catalyst comprising the solid acid, and reaction using the solid acid as catalyst

Abstract

A carbon-based solid acid which has high activity and high thermal stability and is useful as an acid catalyst for various reactions such as hydration of olefins. The carbon-based solid acid for use as a catalyst is obtained by carbonization and sulfonation of an organic substance, which has a reduction rate of 10 mol % or less of acid content as measured by immersing the solid acid in hot water at 120° C. for 2 hours, is used as the acid catalyst. The organic substance to be used as the raw material for preparing the solid acid is preferably a saccharide having β1-4 glycosidic bond (e.g. cellulose) or lignin. Amylose is also suitable as the raw material. Examples of the reaction for which the solid catalyst can be used include hydration of olefins, etherification of olefins, and acid/alcohol esterification.

Claims5

Dependent claims

A carbon-based solid acid obtained by carbonization of an organic substance and by sulfonation after completion of carbonization, and having a reduction rate of 10 mol % or less of acid content caused by immersing the solid acid in hot water of 120° C. for 2 hours,

wherein the carbonization is performed in inert gas atmosphere at 250 to 600° C. for 1 to 50 hours and the sulfonation is performed at 100 to 450° C. for 0.5 to 30 hours, the peak intensity ratio D/G of D-peak to G-peak for the carbon-based solid acid in Raman spectroscopy is 0.5 or more and less than 1.0;
and
wherein the organic substance comprises lignin as a main component.

Dependencies are inferred from the claim text.

Facts

Application

12/282,253Filed 8 Mar 2007

Priority

JP 2006-06672110 Mar 2006

Published

US 2009/0099345 A116 Apr 2009

Granted

6 Sep 2011

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 codes

C07C 29/04
By addition of hydroxy groups to unsaturated carbon-to-carbon bonds, e.g. with the aid of H2O2: by hydration of carbon-to-carbon double bonds
B01J 27/02
Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon…
B01J 37/084
Decomposition and pyrolysis: decomposition of carbon-containing compounds into carbon
C01B 32/05
Carbon; Compounds thereof: preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30

Carbon-based solid acid, catalyst comprising the solid acid, and reaction using the solid acid as catalyst

Life of this patent

Carbon-based solid acid, catalyst comprising the solid acid, and reaction using the solid acid as catalyst

Life of this patent

Abstract

Claims5