Benzimidazole and its derivative synthetic method

The method for preparing benzimidazole and its derivative is characterized by that it uses o-phenylenediamine and its derivative and organic carboxylic acid as raw material, uses the alcohol substances of 1,2-propanediol, etc. as solvent of reaction system and cyclization catalyst, under the condition of a certain temp. makes them produce reaction to prepare the invented product. Said method is applicable to general organic carboxylic acid, and the 1,2-propanediol and other alcohol substances can be recovered and circularly used.

Recovering method of hydrogenation catalyst nickel in nafronyl oxalate

A process for reclaiming the hydrogenating catalyst (Raney nickel) in naphthylamine-ester-oxalate includes mixing the used Raney nickel with the 5-15 % concentration aqueous solution of potassium (orsodium) hydroxide while introducing hydrogen gas under 2-3 atm. reaction at 50-80 deg.c for 0.5-2 hr, and washing with water or absolute alcohol until its pH value=7-8. Its advantages are high reclaiming effect and productivity, and low cost.

Method for removing organochlorine from hydrocarbon oil

The invention relates to a method for removing organochlorine from hydrocarbon oil. A demulsifier, an alkaline compound, a phase transfer agent, injected water and the hydrocarbon oil are mixed, oil-water separation is performed under the action of a thermal field and/or an electric field, organic chloride is transformed into inorganic chloride and the inorganic chloride is removed with a water phase, so that the aim of dechlorination is fulfilled. The method is suitable for organochlorine-containing conventional crude oil, heavy crude oil and distillate oil.

Method for purifying phosphine by-product and application method of phosphine by-product

The invention relates to a method for purifying a phosphine by-product in a process of producing sodium hypophosphite, and a method for synthesizing trialkyl phosphine by using the phosphine by-product. The method for purifying the phosphine by-product comprises the following steps that: 1) phosphine tail gas produced in a sodium hypophosphite reactor is drawn out from a tail gas exhaust port at the upper end of the reactor, and then naturally passes through a water seal tank by means of the pressure produced by a water seal in the water seal tank; 2) the gas passing through the water seal tank enters a water seal purifier filled with sodium hydroxide aqueous solution for purification; and 3) the phosphine gas purified by the purifier enters a gas-water separator to carry out gas-water separation so as to obtain a dried gas. The method provided by the invention realizes high added value utilization of the phosphine by-product, and greatly reduces the production cost of the trialkyl phosphine ...

Method for purifying phosphine by-product and application method of phosphine by-product

The invention relates to a method for purifying a phosphine by-product in a process of producing sodium hypophosphite, and a method for synthesizing trialkyl phosphine by using the phosphine by-product. The method for purifying the phosphine by-product comprises the following steps that: 1) phosphine tail gas produced in a sodium hypophosphite reactor is drawn out from a tail gas exhaust port at the upper end of the reactor, and then naturally passes through a water seal tank by means of the pressure produced by a water seal in the water seal tank; 2) the gas passing through the water seal tank enters a water seal purifier filled with sodium hydroxide aqueous solution for purification; and 3) the phosphine gas purified by the purifier enters a gas-water separator to carry out gas-water separation so as to obtain a dried gas. The method provided by the invention realizes high added value utilization of the phosphine by-product, and greatly reduces the production cost of the trialkyl phosphine ...

[(2-n-propyl-4-methyl-1H-Benzimidazole)6-radical] carboxamide-1-radical] methylbiphenyl compound, synthesizing method and usage