To produce a large amount of MHAC extremely economically, while certainly and simultaneously performing actions of removing generated heat to avoid local temperature peaks; controlling pressure rise safely; nearly preventing accumulation of products at the product changeover; suppressing side reaction products; and obtaining products with uniform substitution patterns.
The apparatus for industrially producing methyl hydroxyalkyl celluloses (MHACs) by the reaction of cellulose with an alkali metal hydroxide and subsequent reaction with an alkyl halide and a hydroxy alkylating agent includes a reactor which has an L/D ratio of less than 2.5. The reaction is carried out batchwise in a reactor in which the unmixed regions are minimized and the batch reactor is preceded at the inlet by a continuously operated cellulose milling facility and is followed at the outlet by a continuously running plant for milling and drying the products. The product is transported by the action of gravity.
MICHEL STEFAN DR
SONNENBERG GERD
| JPS5225887A | 1977-02-26 | |||
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| JPH0236920A | 1990-02-06 | |||
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