SU798146A1 - Hydrolyzed lignin-based press-composition - Google Patents

Description

Total hydroxyl groups, 31

Methoxy groups

OSNd11,22

Carboxyl

COOH groups 4,32

In sulphite-alcohol bard, aromatic acids,% p-hydroxybenzoic, brown 3.74, syrenev 0.7, vanillin 0.5, gallium 0.3, hydroxypropane 0.09 from water soluble bards are identified / hydrated.

The active weight of sulfite yeast brew and sulfite alcohol bards pH 4.5-7.1 is active.

The introduction of sulphite-alcohol stillage or sulphite-yeast brew increases in the press composition the number of full-length substances with reactive groups that enter into chemical interaction with the remaining reactive groups of the lignin polymolecule, with polymer-like compounds based on monosaccharides of hydrolysis lignin, increasing the reactivity of the whole press compositions. Due to the high fluidity of sulfite-alcohol stillage or cypho-yeast brew, plasticity and physical contact between the particles of lignin and barda or mash are increased. As a result, a monolithic structure is obtained from the entire press composition, which provides for an increase in the basis of hydrolytic lignin.

The invention is illustrated by example.

For the manufacture of the press composition, wood hydrolysis lignin is taken, in which sulphite alcohol distillery dill is additionally introduced (PRS according to GOST 8518-57) or sulphite-yeast mash (PSD according to MRTU 13-04-35-66)

The dispersion of wood hydrolytic lignin is less than 2 mm. These components are thoroughly mixed to obtain a homogeneous mass, which is then dried to a residual moisture content of 5%. Get press compositions, differing from each other by the ratio of components. In each press, sulfite-alcohol stillage or sulphite-yeast brewer are early in succession of 3, 5, 6, 8, 10 wt.% And tree hydrolyzed lignin, respectively 97, 95, 94, 92, 90 nos.%.

The prepared press composition is pressed at a temperature of 20 ° C and a pressure of 30 MPa into a briquette, which is pressed at a pressure of 15 MPa and product.

Physico-mechanical tests are subjected to samples with dimensions of 200x5Q; io mm, cut from sheet

products 10 mm thick. From each press composition, 30 samples are tested.

When testing products, determine their density, tensile strength under static bending and water absorption by weight in 24 hours.

The test results are presented in t ablitz.

The table shows that the strength properties of products from press compositions with the addition of sulfite-alcohol stillage or sulphite-yeast brss1G {si, significantly exceed such indicators of products from one lignin, and water absorption of products from press-compositions with the addition of sulphite-alcohol stillage or sulphite yeast brew below, which confirms the advantages of the proposed press composition.

The optimal amount of sulfite-alcohol stillage or sulphite-yeast mash in the press composition is in the range of 5-8 wt.% (Press positions 2,3 and 4). With such an amount of sulfite-alcohol stillage or sulphite-yeast brew, the greatest reactivity of the press composition is achieved, which leads to the complete assurance of all physicochemical processes in it, to obtain a dense and durable monolithic structure of products. This all increases the strength of products and at the same time reduces their water absorption.

Sulfite-alcohol stillage or sulphite yeast mash in the press composition less than 5 wt.% (Press composition 1) leads to a decrease in the fluidity of the press composition, to a small increase in its reactivity, to an incomplete completion of physical and chemical processes, which causes a decrease in strength products and increases their water absorption. The presence in the press composition of sulfite-alcohol stillage or sulphite-yeast brewing more than 8 wt.% (Press position 5) leads to a small increase in the strength of products compared to products from the press composition with the presence of 8 wt.% Sulphite-alcohol stillage or sulphite-d. and the water absorption of the products does not change. .

The introduction of sulphite-alcohol stillage or sulphite-yeast brew into a press composition based on hydrolytic lignin makes it possible to increase the strength of products during static bending by 2.4-2.9 times, to reduce water absorption by 3, 2-3.8 times as compared to products from well-known press positions. This increases the durability of extruded products, which are operated both during normal and increased viscosity.

97: 3 95. 5 94: 6 92: 8 90:10

6

We offer press composition

4.3 2.5 2.2 2.1 2.1

press room oz qi

in, 00

1300 6.00

Claims (2)

Invention Formula Press composition based on hydrolytic lignin, characterized in that, in order to improve the physicomechanical properties of the products, the press composition additionally contains sulphite-alcohol bard or sulphite-yeast brew with the content of water-soluble substances 97-99% and pH 4.5-7.1 with the following ratio of components, wt.%: Hydrolytic lignin 92-95 Sulphite-alcohol bard or sulfite yeast brew 5-8 Sources of information, pr T ;; | e into account during the examination 1. USSR Copyright Certificate № 379406, cl. At 29 U 5/00, 1974. 2. A.N. Minin, Piezo-thermoplastic technologists. M., Lesna industry, 1965., p. 256-259 (prototype).