SU636212A1 - Method of isolating anthracene - Google Patents

Description

The present invention relates to the processing of coal tar, in particular to the isolation of anthracene. Izps-prana anthracene ka pipa method of reproduction. The disadvantage of this method is the great loss of anthracene in the process of isolation, the need to use sophisticated equipment and large energy costs. It is known to separate anthracene from anthracene containing polymer by separating the crude anthracene by crystallizing washing with a solvent, followed by distilling the washed anthracene, regenerating the solvent from the resulting washing of the mother liquor and feeding the regenerated solvent to washing stage 2. Regenerating the solvent by using a process, using a regenerant, the process was washed by means of a solvent. The mother liquor contains, in addition to diluent and impurities, a significant amount of anthracene. The disadvantages of the method are the losses of the desired product with bottom residues resulting from the regeneration of solvents and, consequently, a decrease in the degree of recovery of the target product and high heat consumption for solvent regeneration. To utilize the bottoms from the regeneration of the solvent, they are dissolved in anthracene oil. At the same time, due to the presence of insoluble anthracene and carbazop in bottoms, a large amount of anthracene oil is required (85-9 O% of the total amount of residues. The aim of the present invention is to increase the degree of anthracene recovery and reduce the energy costs for solvent regeneration. The goal is achieved the method of separation of anthracene from altracene-containing by separating the crude anthracene by crystallization, washing it with a solvent, followed by distillation of the washed anthrac and a regeneration

dissolve n from the mother liquor formed during washing.

The differences in the method consist in the preliminary mixing of the hot anthracene-containing raw material having a temperature of 27 ~ 330 ° C with the mother liquor with simultaneous separation of the solvent recovered at the same time and feeding the residue to the release of the raw anthracene.

The anthracene fraction of stone-coal tar used for separation of anthracene from a distillation column with a temperature of 27О-ЗЗЗ C is used as an anthracene containing polymer.

Due to the heat of the anthracene containing solvent, the solvent is distilled off and after condensation returns to the process. The bottoms product consisting of anthracene-containing raw materials and residues of the mother liquor containing anthracene, carbazone, and y) impurities is sent to the anthracene extract.

Thus, the present method allows the anthracene to be drained from the mother liquor, utilize the heat of the containing raw material and, step by step, reduce energy costs and eliminate the step of dissolving the bottoms from the solution regeneration in anthracene oil.

Example I. (By a known method for comparison). 10 kg of an anthracene fraction containing 6.3% aHipaueHa, crystallized without adding residual mother liquor. This gives 2.12 kg of anthracene containing 18% pure anthracene.

The amount of pure anthracene in raw is 2.12 "0.18 0.38 kg.

2.12 kg of anthracene are subjected to extractive washing. Obtain O, 716 kg of a mixture of anthracene and carbazole containing 43% or O, 716 "O, 43 0, 30% of the kg of anthracene. This mixture is rectified and 0.395 kg of the fraction containing 70% and neither 0.395-0.7OO, 277 kg of anthracene is taken. After crystallization of the fraction, O is obtained, 281 kg of anthracene with a concentration of 96%, which contains 0.281 O, 96 s O, 27 D kg of pure anthracene.

The yield of pure anthracene from resources in raw anthracene is O, 27

oGza-

The yield of pure anthracene from the resources in the fraction is 0,

..;. ,,. , pg.42.5% 100.063

PRI mme R 2. (According to the method described), 10 kg of the anthracene fraction, with a temperature of 270 C containing 6.3% anthracene, are mixed during the regeneration of the solvent with 1.5 kg of mother liquor residues containing 16% anthracel.

Get 11.5 kg of a mixture containing 7.55% pure anthracene. During the crystallization of a mixture of vydela from 3.1 kg of anthracene, vxgor contains 19% anthracene. The amount of pure anthracene in raw is 3.1 0.19 - 0.59 kg.

3.1 kg of anthracene is subjected to extractive washing. 1.116 kg of a mixture of anthracene and carbazop containing 43% or 1.116 0.43 O, 48O kg anthracene is obtained. This mixture is rectified and 0.617 kg of anthracene fraction is collected. The fraction contains 70% of Oi O, 617 S, 70 - 0.432 kg of anthracene. After crystallization of the fraction, 0.427 kg of anthracene is obtained in a concentration of 96%, in which 0.427? 0.96 O, 41O kg of anthracene is contained.

The yield of pure anthracene from resources in raw anthracene is O, 4101OO

0.59 -

The yield of pure anthracene from the resources in the fraction is O,

 65%.

10-0,063

PRI me R 3. (According to the described method). 10 kg of anthracene fraction with a temperature containing 6.3 weight of anthracene, mixed with the regeneration of solvent with 1.5 kg of residues of the mother liquor containing 16% anthracene.

11.5 kg of mixture are obtained, containing 7.55% pure anthracene. During the crystallization of the mixture, a sweat of 3.1 kg of crude anthracene, containing 19% pure anthracene or 3.1 0.19 -0.59 k

Claims (2)

3.1 kg of anthracene is subjected to extractive washing. 1.116 kg of a mixture of anthracene and carbazole containing 43% or 1.116 0.43 0.480 kg of anthracene are obtained. This mixture is rectified and 0.6 to 17 kg of anthracene fraction is taken. 70% or 0.617 0.70 0.432 kg of anthracene is contained in the fraction. After crystallization of the fraction, 0.4 to 27 kg of anthracene with a concentration of 96% is obtained, in which O is contained, 427 O, and 96 0.41 O kg of anthracene. The yield of pure anthracene from resources in raw anthracene is 0.410 "100 The yield of pure anthracene from resources in the fraction is 0, 410100 10.0.063 Thus, the yield of pure anthracene from resources in the anthracene fraction when using the proposed method is increased by 22.5%, The utilization of heat from the anthracene fraction saves 20 million kapas per year, while the capacity of the installation for the anthracene fraction is 40 thousand tons per year. Claims method of separating anthracene from anthracine-containing raw material by separating anthracene from crystallization, washing it with a solvent followed by distillation of the washed anthracene, regenerating the solvent from the mother liquor formed during washing, in order to increase the recovery of the target product and reduce energy consumption, the mother liquor the solution is mixed with hot anti-raw materials, which have a temperature of 27 ° -330 ° C, with simultaneous separation of the solution that is regenerated. feed and feed residue to separate crude anthracene. Sources of information taken into account in the examination 1. Coke chemistry co-chemist, T. 3. M., Metallurgists, 1966, p. 366-367. 2.Isayenko, IP, Markacheva, TM, A New Way to Produce Pure Anthracene and Carbazole. Coke and Chemistry, 1958, No. 12, p. 35-41.