DE326705C - Process for the treatment of wood or cellulosic materials for the production of cellulose and synthetic resin, paint, asphalt and the like like - Google Patents

Description

for BiCL ¹ CTHETEK 1

■ 1 UtCi

ISSUED
ON SEPTEMBER 30, 1920

REICH PATENT OFFICE

PATENT LETTERING

- JVl 326705 CLASS 55 b GROUP 1

Dr. Richard Harfcmuth in Berlin.

Process for the treatment of wood or cellulosic materials for the purpose of extraction of cellulose and synthetic resin, paint, asphalt and the like.

Patented in the German Empire on July 9, 1919.

When treating wood or other cellulosic substances with phenols or It was phenol derivatives for the production of cellulose, apart from the fact that it was it was difficult to break down the starting materials to the desired! extent, not possible, to extract the non-cellulosic components of the wood in valuable form. That forming the subject of the invention

ίο procedure now combines the advantage in one work process an outstandingly beautiful, unaffected and dazzling one to obtain white bleached pulp in large yield and at the same time the other components of the starting material, in particular the lignin substances, by chemical bonding to be converted into usable form. By changing the test conditions accordingly, it is possible to

ao prey, degree of digestion and quality of the resulting pulp in determining Way to influence. All attempts after which with the help of organic extraction and Solvents without a catalyst cellulose

as is to be obtained from wood, the Examination has not withstood, and somehow it does not succeed in this way of wood to unlock completely. On the other hand, it was known to have phenols with certain Aldehydes form resins and the like using a contact substance; so one has Similar compounds made using furfural with phenols. Goes but if you proceed according to the process of the invention, the result is a complete yield the non-cellulose components of wood in the form of a plastic that is used there can be found where otherwise natural resins, pitch, asphalt, lacquers and the like are used. This Product can be mixed with other organic substances as well as with inorganic substances Weighting agents are used as asphalt or can, for. B. can also be used for marine glue or sealing wax the; by loosening this plastic one obtains a valuable lacquer or a valuable one Furniture stain.

The new process consists in the fact that the material to be digested (wood waste, Waste paper, newsprint, types of grass and other cellulosic substances) with one or polyhydric phenols or their homologues and substitution products, i.e. at all Compounds with a phenolic character, in concentrated form or also diluted with water, alcohols, benzene, benzene derivatives or hydrocarbons of the fat series heated, with the mixture small amounts of a catalyst (e.g. 0.01 percent hydrochloric acid) attached. The more concentrated the phenol or the substances mentioned Brings application, the lower the amount of catalyst added can be. By more or less long heating or boiling on the reflux condenser or also in an autoclave under pressure or in a reflux condenser under reduced pressure it is possible to achieve a complete digestion with the formation of snow-white cellulose obtain.

Claims (2)

The cellulose is separated from the digestion liquid in a known manner, thereby Most of the organic matter used for the digestion can be found in their original; Distill off Forth again and yßn jrcuemiyerjenken. In the still ' "What remains as a residue is the entire lignin content of the wood, which is in connection with a remainder of the used recording o in the end forms the valuable by-products identified above. The parts of the Cellulose, which is otherwise destroyed and lost as the digestion proceeds. • go, in contrast to this, remain with the new procedure and therefore increase the total yield: Ρλτ iiNT claims:
i. Process for the treatment of wood or cellulose-containing materials for the purpose of obtaining cellulose and artificial resin, paint, asphalt and the like, characterized in that the starting material is concentrated with phenols or compounds with phenol-like character or also diluted with water, alcohols, benzene , Benzene derivatives or hydrocarbons of the fat series heated with the addition of a catalyst. 2. The method according to claim 1, characterized in that the catalyst 3 » 0.01 percent hydrochloric acid is used.