Acid liquor washer for preparing hydroxypropyl methyl cellulose

Abstract

The invention discloses an acid liquor scrubber for preparing hydroxypropyl methyl cellulose, and belongs to the technical field of chemical instruments. Mainly comprises a base, a driving assembly arranged on the base, a stirring assembly arranged on the base and matched with the driving assembly, and a containing assembly arranged on the base and matched with the stirring assembly. The stirring assembly comprises a second containing unit, a rotating shaft arranged in the second containing unit, a stirring paddle arranged in the second containing unit and fixedly connected with the rotating shaft and a folding rod arranged in the second containing unit and fixedly connected with the rotating shaft, and the interior of the rotating shaft is hollow; a plurality of spray holes are formed in the side wall of the end, away from the connector, of the rotating shaft, and the folding rod is attached to the inner wall of the second containing unit. Acid liquor is fused with cellulose from bottom to top, and the cellulose standing and attached to the inner wall of the second containing unit is turned over through the stirring paddle and the folding rod, so that sufficient fusion of the acid liquor and the cellulose is ensured.

Description

technical field [0001] The invention relates to the technical field of chemical instruments, in particular to an acid scrubber for preparing hydroxypropyl methylcellulose. Background technique [0002] In the process of synthesizing hydroxypropyl methylcellulose from cellulose contained in wheat straw, it is necessary to heat the pretreated straw powder with an alkyd system, and reflux to extract cellulose for 3-4 times until the powder is completely white. Use hot water to wash and heat to reflux, then wash with ethanol, dry and pulverize to obtain alkali fibers, then alkalinize the alkali fibers again, and carry out etherification, then wash with acid solution, centrifugal dehydration and wash to neutrality, and then dry , pulverized to obtain hydroxypropyl methylcellulose. [0003] For the acid washing in this process, various acids such as oxalic acid and hydrochloric acid are needed to react with the etherified cellulose. [0004] The traditional pickling is mostly ma...

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Problems solved by technology

[0004] Traditional pickling is mostly manual operation. In this case, it is difficult to mix the etherified cellulose and acid solution sufficiently, and part of the cellulose lacks stirring, so the acid solution cannot be completely immersed in the cellulose at the bottom of the container. Adhering to the inner wall of the container, it is difficult to fully mix with the acid

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