I. A. Golubeva

Synthesis and properties of sym-triazine derivatives. 2. Synthesis of amino-sym-triazines containing fragments of sterically hindered phenol

The reaction of mono- and dichloro-sym-triazines with 4-hydroxy-3,5-di-tert-butyl-aniline was studied. N-substituted derivatives of 2,4,6-triamino-sym-triazine were synthesized, containing fragments of sterically hindered phenol.

Synthesis of alkyl carbamates in the presence of an aluminosilicate catalyst

Conclusions1.A process was developed for obtaining alkyl carbametes from urea and the corresponding alcohols in the presence of an aluminosilicate catalyst.2.Optimal regions for synthesis of methyl carbamate were determined by the Box-Wilson method of multifactor systematization.3.The effect of various factors (temperature and length of reaction, ratio of initial reagents, space velocity of raw-material introduction, quality of the initial raw material, and length of operation of the catalyst) on the yield of methyl carbamate were studied.4.C2-C5 alkyl carbamates were obtained in yields of 75–79% of the theoretical under the optimal conditions found for methyl carbamate.

Extraction of light gas oil from catalytic cracking with alkylcarbamate

Conclusions1.A mixture of methyl- and ethyl-carbamates is an effective solvent for the extraction of the bicyclic, aromatic hydrocarbons from the kerosene-gas oil fractions of petroleum products by the method of liquid extraction,2.The conditions were determined for the liquid extraction of the light gas oil from catalytic cracking with alkylcarbamate to obtain an aromatized extract which contains 95% aromatic hydrocarbons including 54,5% bicyclic hydrocarbons. The extract yield is 27.5% calculated on the gas oil. A 70% dearomatized raffinate is obtained which is a high-quality component for diesel fuel.3.In the extraction separation of the light gas oil from catalytic cracking of a low-sulfur vacuum-distillate with the alkylcarbamate and hydrogenation of the extract the following are obtained (calculated on the gas oil): 10% naphthalene, 7% high-octane component of gasoline, and 70% of the diesel fuel component.

Synthesis of alkyl carbamates—selective solvents for aromatic hydrocarbons

Conclusions1.The synthesis of alkyl carbamates (C1-C5) has been conducted in the presence of KU-2 ion-exchange resin, in an autoclave and in a laboratory semi-continuous action assembly.2.Optimum conditions for the synthesis of methyl carbamate or KU-2 catalyst have been selected: temperature, 140°; molar ratio, methanol to urea, 9∶1; reaction time, 15 min.3.It has been shown that the catalyst operates for a period of 200 h without reducing the yield of methyl carbamate.