System and method for recovering activity of glucose hydrogenation catalyst

Abstract

The invention relates to a system for recovering the activity of a glucose hydrogenation catalyst. The system comprises a glucose hydrogenation reaction kettle, a condensed water tank, a primary settling tank, a catalyst cleaning tank and a catalyst storage tank, a catalyst inlet, a condensed water inlet, a catalyst outlet and a cleaning liquid outlet are respectively formed in the catalyst cleaning tank; the catalyst inlet is communicated with the bottom of the primary settling tank through a catalyst feeding pipeline, the condensed water inlet is communicated with the condensed water tank through a condensed water feeding pipeline, the catalyst outlet is communicated with the catalyst storage tank through a catalyst discharging pipeline, and the cleaning liquid outlet is communicated with a sewage pool through a cleaning liquid outlet pipeline. The primary settling tank and the catalyst cleaning tank are respectively provided with a hot purified water inlet which is communicated withhot purified water. The invention further discloses a method for recovering the activity of the glucose hydrogenation catalyst. Steam condensate is used for cleaning the catalyst, the activity of thecatalyst is recovered, and the service life of the catalyst is prolonged; and the system is simple and low in investment, and the production cost is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of sugar alcohol preparation, and in particular relates to a system and method for restoring the activity of a glucose hydrogenation catalyst. Background technique [0002] The Raney nickel catalyst is commonly used in the hydrogenation of glucose to produce sorbitol. During the reaction, some substances will be adsorbed on the surface of the catalyst, such as soluble protein, sugar decomposition products, etc., which will affect the activity of the catalyst, so it needs to be cleaned and periodically reduced to its lye , to remove the substances attached to the surface and restore its activity. At present, 5% sodium hydroxide solution is used for cleaning, but sodium hydroxide will react with iron ions and aluminum ions in the catalyst, destroying the structure of the catalyst, shortening the service life of the catalyst, increasing the sewage treatment load, and increasing production costs. [0003] On th...

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Problems solved by technology

In the process of steam production, ammonia water is usually added to the purified water, so that the pH of the steam condensed water is 7.5~8, which is weakly alkaline, and the temperature of the condensed water after steam use is as high as 90~100°C. The utilization of this part of the condensed water It mainly focuses on the recovery of heat energy, and its weak alkaline characteristics have not been fully utilized

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