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Start-up process for the production of glycols

A diol and catalyst technology, applied in the field of start-up procedures, can solve problems such as reducing catalyst performance, reducing product yield, and operating confusion

Pending Publication Date: 2021-04-20
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Over time, this deposition can lead to reduced product yields, operational confusion and reduced catalyst performance

Method used

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  • Start-up process for the production of glycols

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 3

[0059] Example 3: Stabilization of Tungsten in Solution

[0060]0.5 grams of 1.2 wt% Ru / C (RX3-extra) (3-80 mesh) hydrogenation catalyst was loaded into the reactor. The catalyst was reduced in a reactor at 300° C. for 1 hour under H2 flow (3 NL / min) at atmospheric pressure (absence of liquid). After catalyst reduction was complete, the temperature was lowered to 230°C and the pressure was raised to 100 bar. Water was fed into the reactor at a rate of 60 g / L until steady state operation was obtained. Without changing the feed rate of liquid or gas, the water feed was switched to a mixture containing 1 wt. Reactive aqueous solution. These conditions were similar to the experiments described in Comparative Examples 1 and 2 (except glucose and buffer in the feed).

[0061] The reaction was carried out for 115 hours. When the water wash was complete, the pH stabilized at ~5. After switching to the aqueous reaction solution, a drop in pH was observed. The pH stabilized at a ...

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Abstract

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.

Description

[0001] This application claims the benefit of US Provisional Application 62 / 730,569, filed September 13, 2018. technical field [0002] The present invention relates to a start-up procedure for a process for the production of ethylene glycol and propylene glycol from sugar-containing raw materials. Background technique [0003] Monoethylene glycol (MEG) and monopropylene glycol (MPG) are valuable materials with various commercial applications, for example as heat transfer media, antifreeze and precursors for polymers such as PET. Ethylene glycol and propylene glycol are generally produced on an industrial scale by hydrolysis of the corresponding alkylene oxides, which are oxidation products of ethylene and propylene (produced from fossil fuels). [0004] In recent years, increasing work has focused on the production of chemicals, including diols, from renewable raw materials such as sugar-based materials. The conversion of sugars to diols can be seen as an efficient utiliza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/141C07C31/20
CPCC07C29/132C07C31/202B01J21/18B01J23/30B01J23/462
Inventor D·J·M·德弗利格P·休伊曾加M·麦凯L·P·S·凯泽D·穆桑米
Owner SHELL INT RES MAATSCHAPPIJ BV