The method of microcrystalline cellulose

 

(57) Abstract:

The invention relates to the modification of cellulose, in particular to a method for producing microcrystalline cellulose(MCC),which finds application in food, pharmaceutical, cosmetic, porcelain, ceramic industry. Microcrystalline cellulose is obtained by processing fibrous waste cotton and textile industry when heated to 80oC for 1 h with a mixture of 3.5% hcl and 0.6% nitric acid in the presence of catalyst (10% phosphorus molybdenum acid at the liquid module 1:10, followed by rinsing and drying. The invention allows to simplify the technology of the ICC and to obtain a homogeneous molecular mass of cells with high yield and degree of polymerization 130-190. table 1.

The invention relates to the modification of cellulose, in particular to a method for producing microcrystalline cellulose (MCC), which finds application in food, pharmaceutical, cosmetic, porcelain, ceramic industry.

A method of obtaining MCC, using hydrochloric acid solutions with application-low-tech gaseous reactants (e.g., peroxide x is 1/00, 1987).

Closest to the invention is a method for MCC - ed. St. USSR N 1812179 A, class C 08 B 1/00, 1990, where the oxidant using gaseous ozone.

In this way a good degree of polymerization are associated with lower output ICC and harmful emissions into the atmosphere.

The technical result of the present invention is to simplify the process of obtaining ICC, uniform molecular weight, increasing the degree of homogeneity in the degree of polymerization (SP < 200), which is set to improve reactivity and physico-chemical properties.

The invention is illustrated by examples. For all examples are taken lint with the following parameters: the average fiber length is 7-8 mm, litter - 4,5%, ash content of 1.7% content-cellulose 96%.

Example 1

Lint treated with 100 ml of a mixture of 3-acids of 3.5% hydrochloric acid, and 0.6% nitric acid, 10-3% phosphorus molybdenum acid at a temperature of 80oC for 1 h, the processing module 1:10. The obtained MCC filtered and washed with a neutralizing solution of concentrated soda and water, then treated with absolute ethanol or butanol and dried.

The output ICC - 88%, average degree of polymerise the method presented in the table.

The product obtained in 1 and 4-6 examples, has the best performance according to the degree of polymerization and the output of the LCC. The absence in the reaction mixture of nitric acid or phosphorus-molybdenum acid (example 2, 3) leads to a fall in output ICC and reduce the homogeneity of the resulting product.

Example 7 shows that increasing the concentration of phosphorus molybdenum acid two orders of magnitude leads to a deterioration of parameters of the process of obtaining MCC, i.e., the best performance is achieved at low concentrations of phosphorus molybdenum acid in solution.

The invention allows to obtain more uniform molecular weight MCC, with a higher yield and degree of polymerization 130-190, to simplify the technology of its receipt.

The method of microcrystalline cellulose by treatment of cellulosic material, which is used as the fibrous waste cotton and textile industry, with a mixture of hydrochloric acid and an oxidizing agent when heated to 80oC for 1 h followed by washing and drying, characterized in that the mixture used in 3.5% hydrochloric acid with an oxidant to 0.6% nitric acid, and the treatment is carried out in prisutstvie the

 

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12 ex, 1 tbl, 1 dwg

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