Shell Oil Comapny

Shell USA, Inc.

Munro MacKay

Evert Van Der Heide

Pieter Huizenga

Martin F Post

Johannes J Keijsper

Duraisamy Muthusamy

Dionysius Jacobus Maria De Vlieger

Lucas Petrus Simon Keyzer

The invention provides a start-up method for a process for the preparation of glycols from a starting material comprising one or more saccharides in the presence of hydrogen and a catalyst system comprising one or more retro-aldol catalysts comprising tungsten and one or more catalytic species suitable for hydrogenation in a reactor, said method comprising introducing the one or more retro-aldol catalysts to the reactor whilst also in the presence of one or more agents suitable to suppress tungsten precipitation.

Start-up process for the production of glycols

A xylan-containing feed is contacted, in the first reactor essentially operated at plug flow, with an aqueous solution of an acid at a temperature in the range from equal to or more than 140&#xb0; C. to equal to or less than 210&#xb0; C. to produce an intermediate product. Then, the intermediate product is contacted, in the second reactor which comprises a continuously stirred tank reactor, with an aqueous solution of an acid at a temperature in the range from more than 130&#xb0; C. to equal to or less than 200&#xb0; C. to produce a final product.

Process for the conversion of a xylan-containing feed

Crystalline (metallo)silicates having in the as-synthesized, anhydrous form a molar composition expressed by the formula:

Crystalline (metallo)silicates and process for preparing such

Growing community of inventors

Amsterdam, Netherlands

Munro MacKay