The method of obtaining 2-naphthol

 

(57) Abstract:

The method of obtaining 2-naphthol by sulfonation of naphthalene with sulfuric acid at 160-163oWith, hydrolysis, Stripping acute water vapor and neutralizing the resulting sulfatase, alkaline melting the obtained reaction mixture, processing the obtained melt water, acidification received naphthalate sodium and selection of the target product, characterized in that before Stripping sulfones mixed with a hydrocarbon selected from the group of benzene, toluene, xylene or naphthalene, at 60o-90oAnd water taken in the ratio 1 : (0,25-1,0) : (0,4-1,2).

 

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FIELD: chemistry.

SUBSTANCE: present invention relates to a method for synthesis of 1,3,5-trihydroxybenzene (phloroglucinol) used as an initial component for synthesis of epoxide and thermosetting resins for making protective coatings, as a semi-finished product in making dyes etc. The method involves hydrolysis of a 1,3,5-triaminobenzene salt with an inorganic acid while heating in an acidic medium. The hydrolysis process is carried out in suspension with mass ratio salt: water equal to 1:1.75 in the presence of an ammonium salt. As a rule, the 1,3,5-triaminobenzene salt with an inorganic acid used is a dihydrate of 1,3,5-triaminobenzene disulphate or a dehydrate of 1,3,5-triaminobenzene diphosphate.

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2 cl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing 2-(4-hydroxyphenyl)ethanol (p-thyrozol), having a marked stimulating effect, immunomodulating and cardioprotective activity, anticarcinogenic and anti-inflammatory properties. The method includes nitrating 2-phenylethanol, reducing 2-(4-nitrophehyl)nitroethanol and nitrating 2-(4-aminophenyl)ethanol with subsequent hydrolysis of the diazo-compound. Synthesis and hydrolysis of the diazo-compound is carried out in the presence of n-toluene sulphonic acid with molar ratio 2-(4-aminophenyl)ethanol:n-toluene sulphonic acid = 1.0:2.1-3.0.

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2 tbl, 15 ex

FIELD: chemical industry; methods of production of the phenols by the catalytic decomposition of the cumene hydroperoxide into phenol and acetone.

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13 cl, 4 ex

FIELD: chemistry.

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1 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: method of producing phenol involves: a) oxidising cumene to obtain an oxidation product containing cumene hydroperoxide; b) splitting said oxidation product using an acid catalyst to obtain a splitting product containing phenol, acetone, hydroxyacetone and impurities; c) neutralising and washing said splitting product with an alkaline aqueous medium to form a neutralised splitting product; d) separating said neutralised splitting product via at least one distillation step to obtain at least a fraction containing phenol, and an aqueous fraction containing hydroxyacetone; e) treating said aqueous fraction with an oxidative reagent in the presence of a base to obtain an alkaline aqueous medium with low content of hydroxyacetone; f) recirculating at least a portion of said aqueous alkaline medium to the neutralisation and washing step (c) and g) extracting phenol from said phenol-containing fraction obtained at step d).

EFFECT: obtaining the desired product with efficient removal of the by-product - hydroxyacetone.

25 cl, 1 dwg, 2 ex

FIELD: chemistry.

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2 ex, 1 tbl

FIELD: chemistry.

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10 cl, 4 ex

FIELD: chemistry.

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EFFECT: higher yield.

4 ex

FIELD: chemistry.

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EFFECT: absence of its influence on the performance characteristics of marked gasolines.

3 dwg, 4 ex

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