14 results about "Hydrogen chloride" patented technology

The invention provides an electron-grade hydrochloric acid production method. The electron-grade hydrochloric acid production method sequentially comprises the following steps that 1, synthesized hydrogen chloride gas enters an adsorption tower so as to remove free chlorine; 2, a reagent-grade hydrochloric acid solvent is adopted to enter a washing tower from the inlet in the upper part of the washing tower to wash the adsorbed hydrogen chloride gas so that soluble impurities can be removed; 3, the washed hydrogen chloride gas passes through first condensation and secondary condensation and enters a demister so as to remove mist, so that high-purity hydrogen chloride gas is obtained; 4, high-purity hydrogen chloride is absorbed by a first and a secondary falling film absorber and a tail gas absorbing tower, and then passes through a hyrochloric acid cooler, so that a finished product is obtained; 5, absorbant water adopts hyperpure water; and 6, the finished product obtained in the step 4 enters a finished product storage tank, and is ultrafiltered to remove particulate impurities, so that electronic hydrochloric acid is obtained. The electronic hydrochloric acid production methodhas the characteristics of simple technology, continuous production, good stability,simple equipment, and the like.

The invention relates to a preparation method of D-p-hydroxyphenylglycine methyl ester. The preparation method comprises the following steps: (1) esterifying: carrying out an esterification reaction on D-p-hydroxyphenylglycine and methanol to obtain D-p-hydroxyphenylglycine methyl ester sulfate, and distilling off methanol and water under reduced pressure, wherein the D-p-hydroxyphenylglycine is added one time, and the methanol is added in batches; and (2) crystallizing the D-p-hydroxyphenylglycine methyl ester. The preparation method can very easily control the reaction endpoint, so that theyield and the quality index of the finished product can be guaranteed to the maximum extent; the preparation method provided by the invention avoids the problems of safety and operation caused by hydrogen chloride gas or thionyl chloride; and in the step of D-p-hydroxyphenylglycine methyl ester crystallization, an alkali metal hydroxide is used for adjusting the pH value of the system without using ammonia water, so that the problem that ammonia ions are difficult to treat is avoided.

The invention discloses an inorganic sensitive layer based surface enhanced Raman spectrum detection technology and material preparation thereof. According to the detection technology, a surface enhanced Raman spectrum material based on an inorganic sensitive layer is used as an active substrate of a surface enhanced Raman scattering, and is exposed in the small molecule atmosphere; a new solid substance formed by specific reaction of the inorganic sensitive layer and small molecules to be detected by a Raman spectrometer is detected, and the type of the small molecules is obtained according to the Raman spectrum of the new solid substance; according to the preparation method, a colloid electrostatic self-assembly method, a thiourea-induced isotropic shell growth method, a metal halogenation method and a physical deposition method are used for a precious metal nanoparticle colloidal solution, a metal salt solution and a thiourea solution to prepare the material in which precious metalnanoparticles are coated with a metal oxide layer, or the precious metal nanoparticles are coated with a metal sulfide layer, or the precious metal nanoparticles are coated with a metal halide layer.The technology can be used for real-time online detection of hydrogen sulfide, carbon disulfide, hydrogen chloride, mustard gas, nitrogen dioxide and the like.

The invention discloses a method for recovering acetic acid from waste gas exhausted in production of chloroacetic acid. The recovery method can be used for recovering acetic acid from waste gas exhausted in production of chloroacetic acid. The recovery method comprises the following steps of: taking glacial acetic acid, adding a catalyst, introducing chlorine gas to obtain chloroacetic acid, and crystallizing the chloroacetic acid to obtain a finished product, wherein in the process of producing the chloroacetic acid, chlorine hydride and waste gas are generated. The chlorine hydride is absorbed by water to generate hydrochloric acid, and the waste gas is cooled, and absorbed by waste to recover acetic acid.

The invention discloses a method for catalytic synthesis of dichloropropanol by hydrogen chloride-containing industrial waste gas and glycerol. The method synthesizes dichloropropanol by using hydrogen chloride-containing industrial waste gas and glycerol through a hydrochlorination reaction under the action of a catalyst; wherein the catalyst is zinc acetate or zinc adipate; the reaction temperature is 100-120 DEG C, and the reaction is performed for 72-96 hours under normal pressure. The invention adopts hydrogen chloride-containing industrial waste gas as a raw material, has the benefits of both economy and environmental protection.

The invention discloses aging-resistant polyvinyl chloride plastic. The aging-resistant polyvinyl chloride plastic is prepared from components in parts by weight as follows: 50-70 parts of polyvinyl chloride resin, 30-50 parts of calcium carbonate powder, 3-6 parts of a plasticizer, 2-4 parts of a stabilizer, 2-5 parts of an ACR aid, 1-2 parts of stearic acid, 1-3 parts of nano titanium dioxide, 3-5 parts of an ultraviolet light absorber, 2-3 parts of an antioxidant, 1-2 parts of a coupling agent and 0.5-4 parts of a colorant. The invention further discloses a preparation method of the aging-resistant polyvinyl chloride plastic. Filler, a lubricant, the colorant and other additives are stirred with polyvinyl chloride at the high speed, so that all the additives are uniformly mixed, and a plastic product is uniformly colored and has good antibacterial and anti-aging effects. Meanwhile, the stirring temperature is lower than 100 DEG C, the mixture can be directly added to an extruder or an injection molding machine after stirring, a high-temperature granulation process is omitted, the production process is simplified, and decomposition polyvinyl chloride and release of hydrogen chloride gas can be reduced.

The invention relates to a reaction system for increasing utilization ratio of reactants in chloromethane production and an application of the reaction system. The system comprises a reaction unit, a condenser and a return tank, wherein the reaction unit comprises 2 to 5 reactors which are in series connection, a reactor charging opening I is formed in the bottom end of each reactor, a reactor discharging opening and a reactor charging opening II are formed in the top end of each reactor, a discharging opening of the reaction unit is connected with a condenser charging opening of the condenser, a condenser discharging opening of the condenser is connected with a return tank charging opening of the return tank, a return tank discharging opening I and a return tank discharging opening II are separately formed in the top end and bottom end of the return tank, and the return tank discharging opening II of the return tank is separately connected with the reactor charging openings II of all the reactors. The reaction system disclosed by the invention is applied to the production of chloromethane from methanol and hydrogen chloride, which serve as raw materials, and the methanol and the hydrogen chloride can be in full reaction as much as possible, so that the arranging of a methanol recovery device and a hydrogen chloride recovery device is avoided, energy is saved, and environmental pollution is reduced.

The application of the invention provides a resin catalyst for synthesis and preparation of ethylene glycol tertiary butyl ether and a modification method thereof. The resin catalyst for synthesis and preparation of ethylene glycol tertiary butyl ether is obtained by modification treatment of a polystyrene hydrogen-type cationic resin catalyst and purification treatment. The preparation of the resin catalyst specifically comprises the following steps: pouring a dry polystyrene hydrogen-type cationic resin catalyst into acetone or butanone or mixed liquor of acetone and butanone, stirring and reacting for 8-10 h in a hydrogen chloride gas environment at the temperature of 70-80 DEG C, filtering and carrying out purification treatment. The resin catalyst in the technical scheme has high catalytic activity and selectivity when used as a catalyst for etherification preparation of ethylene glycol tertiary butyl ether.

The invention discloses a method for adsorbing hydrogen fluoride and hydrogen chloride by using an SBA-15 adsorbent, and belongs to the technical field of dry deacidification of waste gas. The method comprises the following steps: crushing SBA-15 to obtain SBA-15 particulate matters, loading the SBA-15 particulate matters on the surface of a filler by adopting a roasting technology, putting the filler into a filler tower to remove hydrogen fluoride and hydrogen chloride gas, and absorbing unreacted hydrogen fluoride and hydrogen chloride gas by utilizing an absorption liquid to finish adsorption of hydrogen fluoride and hydrogen chloride. According to the method for adsorbing the hydrogen fluoride and the hydrogen chloride by fixing the SBA-15 adsorbent on the surface of the filler through a high-temperature filler roasting technology, a good removal effect on the hydrogen fluoride and the hydrogen chloride is achieved, and flying powder is not generated. The adsorption method is simple in equipment structure and simple and convenient to operate, can be widely applied to removal of hydrogen fluoride and hydrogen chloride in various gas sources, and has a very good application prospect.

The invention discloses a trimethyl phosphate preparation method, which comprises following steps: carrying out a mixing reaction on methanol and phosphorus oxychloride, removing hydrogen chloride gas under a negative pressure during the reaction process, carrying out high-negative-pressure low-temperature distillation on the remaining methanol after the reaction, and carrying out rectification to obtain trimethyl phosphate. Compared with the prior art, the preparation method of trimethyl phosphate has the advantages that no wastewater is generated, the wastewater treatment cost is reduced, and environmental protection is facilitated; dangerous chemical products are not used, so that the safety is high; excessive methanol in the reaction can be recycled, so that the preparation cost of trimethyl phosphate is further reduced; and the purity of the prepared trimethyl phosphate is greater than or equal to 99.5%, and the yield is greater than or equal to 90%.

The invention discloses a method and a device for producing granular polysilicon by utilizing the fluidized-bed process. Hydrogen chloride is fed into a fluidized-bed reactor from an expanding section of the top of a fluidized bed and is reacted with fine silicon powder generated in the process of producing granular silicon to generate chloro-silicane gas so that risks of harm to a system due to the fact that the fine silicon powder enters a pipeline at the rear end of the fluidized bed are eliminated, fine silicon powder entrainment is eliminated simultaneously, gas inlet flow of the fluidized bed is improved so as to improve unit capacity of the rector, and production cost is lowered. Besides, the hydrogen chloride fed into the fluidized-bed reactor from the top is reacted with the fine silicon powder to generate chloro-silicane so that circulation of a certain amount of chloride in the reactor is achieved.

The invention belongs to the technical field of hydrogen chloride preparation, and particularly relates to equipment for efficient preparation of hydrogen chloride gas. The equipment includes a towerbody, a motor is installed at the bottom of the tower body, a rotating shaft is arranged inside the tower body, wherein the motor is connected with the rotating shaft in a transmission mode, a controller is arranged at the bottom of the tower body, two groups of stirring modules are arranged on the inner wall of the bottom of the tower body, a concentrated sulfuric acid box is fixedly connected tothe top end in the tower body, and the bottom of the outer side of the concentrated sulfuric acid box is fixedly connected with a partition plate; and the bottom of the partition plate is slidably connected with two groups of rubber air bag modules, a first plastic rope and a second plastic rope are wound on the outer cylindrical surfaces at both ends of the rotating shaft correspondingly, the two ends of the first plastic rope are fixedly connected with the two groups of stirring modules correspondingly, and the two ends of the second plastic rope are fixedly connected with the bottoms of the two groups of rubber air bag modules correspondingly. According to the equipment for efficient preparation of the hydrogen chloride gas, concentrated sulfuric acid and hydrochloric acid can be fullymixed through repeated swinging of the stirring modules, the generation efficiency of the hydrogen chloride gas is effectively improved, the cost is saved, and meanwhile, the quality of the generatedhydrogen chloride gas is improved.