13 results about "Hydrogen cyanide" patented technology

Methods and systems for synthesis using an underwater electric arc. Such methods and systems form an electrical arc between an anode and a cathode positioned under water or within an aqueous mist and introduce an added material into the vicinity of the electrical arc. The formation of the electrical arc in the vicinity of the added material facilitates synthesis of chemical products from the added material. Such synthesized chemical products include ammonia, hydrogen, cyanide, and hydrogen cyanide.

The present invention relates to a method for removing nitric oxide, nitrogen dioxide, and nitrous oxide from an exhaust gas stream obtained during nitration, the method comprising: (a) removing nitric oxide and nitrogen dioxide from the exhaust gas stream by adding an oxygen-containing gas to the exhaust gas stream to oxidize the nitric oxide in the gas stream to form nitrogen dioxide, thereby obtaining a nitric oxide-deficient gas stream; (b) washing the nitric oxide-deficient gas stream with water to obtain a nitric oxide- and nitrogen dioxide-deficient gas stream; and (c) converting the nitrous oxide in the nitric oxide- and nitrogen dioxide-deficient gas stream into nitrogen and carbon dioxide, and optionally oxygen, in the presence of a nitrous oxide reduction catalyst and in the presence of hydrogen cyanide.

The invention provides a platinum-based catalyst and a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The preparation method of the catalyst comprises the following steps: dispersing an oxide carrier in water, dropwise adding an aqueous solution of a platinum precursor under a stirring condition, and drying to obtain a supported catalyst precursor; dispersing the supported catalyst precursor in a buffer solution, adding dopamine hydrochloride, and stirring to form a polydopamine coating layer; and adding a binder into the catalyst with the formed polydopamine coating layer, and drying and roasting to obtain the platinum-based catalyst. The prepared platinum-based catalyst can be applied to a reaction for synthesizing hydrocyanic acid from CH4 and N2O, efficient conversion can be achieved at the low reaction temperature ranging from 370 DEG C to 450 DEG C, and compared with the condition that the high temperature is 1000 DEG C or above needed by a traditional Andru method, a BMA method and other processes, reaction energy consumption is greatly reduced, and meanwhile effective utilization of N2O is achieved.

A process for the hydrocyanation of an organic compound containing at least one olefinic group comprising reacting the organic compound with hydrogen cyanide in the presence of a catalyst complex comprising at least one transition metal and an organic ligand containing at least one P—N linkage, wherein the P and N atoms of the P—N linkage are cach bonded to two other atoms.

The application discloses a calcium-based composite material and a preparation method and application thereof, and comprises the following steps: cleaning and drying high-porosity straw biomass charcoal particles; mixing the biomass charcoal particles with calcium peroxide, and making the powder calcium peroxide enter the pores of the biomass charcoal by vibration to obtain biomass charcoal loaded with calcium peroxide; mixing the biomass charcoal particles loaded with calcium peroxide and calcium hydroxide-containing minerals in a certain proportion to obtain the calcium-based composite material; the calcium-based composite material is added into dried sludge, the adding amount is 5-15 wt.% of the mass of the dry base of the sludge, and then a lignin binder is added, and the sludge is pressed into a shape; in the pyrolysis process, the adding amount can reach a sulfur fixation rate of more than 60%, most of the nitrogen is converted into ammonia, and hydrogen cyanide is greatly reduced, so that the sludge pyrolysis is realized in a manner of synergistic sulfur fixation and nitrogen control, and the emission of pollution gas is reduced.

The application discloses a synthesis method of 3-aminomethyl-3,5,5-trimethylcyclohexylamine. The method comprises the following steps: 1) taking 3-cyano-3,5,5-trimethylcyclohexylimine and hydrogen as raw materials, and performing imine hydrogenation reaction in a solvent in the presence of a first catalyst and a first cocatalyst to obtain 3-cyano-3,5,5-trimethylcyclohexylamine; 2) taking 3-cyano-3,5,5-trimethylcyclohexylamine and hydrogen as raw materials, and performing cyano hydrogenation reaction in an organic solvent in the presence of a second catalyst and a second cocatalyst to obtain a target product; the first catalyst contains one or both of nickel and cobalt; the first cocatalyst is a substance capable of reacting with hydrogen cyanide; the second catalyst contains iron; and the second cocatalyst is a Lewis acid catalyst. The synthesis method can obviously improve the yield and purity of the target product, the catalyst is more stable, the cost is lower, and the synthesis method is more environmentally friendly.

A process for producing acetonitrile, the process comprising dehydrating a feedstock stream comprising acetonitrile, acrylonitrile, allyl alcohol, and water (and optionally methanol) in a dehydration (first) column to yield a dehydrated acetonitrile stream comprising acetonitrile and acrylonitrile, less than 1 wt % allyl alcohol, and less than 50 wt % water, and optionally hydrogen cyanide; distilling the dehydrated acetonitrile stream in a lights (second) column to yield a distillate stream comprising lights, and a bottoms stream comprising acetonitrile, acrylonitrile, water, and optionally hydrogen cyanide and acrylonitrile; extracting the distillation bottoms stream in an extraction (third) column to yield a raffinate stream comprising acetonitrile and less than 200 ppm acrylonitrile and an extract stream comprising water and acrylonitrile; purifying the raffinate stream to yield a product acetonitrile stream.

A direct-fired incineration system for maleic anhydride plant tail gas, relating to the field of environmentally friendly chemical waste treatment, includes a three-stage incinerator, an ultra-high pressure waste heat boiler, a tail gas preheater, and a chimney. The three-stage incinerator comprises a high-temperature combustion section, a high-temperature oxidation section, and an ultra-clean oxidation section connected sequentially. The outlet of the ultra-clean oxidation section, the flue gas passage of the ultra-high pressure waste heat boiler, the tail gas preheater, and the chimney are connected sequentially. A main burner and an auxiliary burner are located at the top of the high-temperature combustion section. Preheated tail gas flows out of the tail gas outlet of the tail gas preheater and is divided into a first tail gas path, a second tail gas path, and a third tail gas path. The first tail gas path is connected to the high-temperature combustion section, the second tail gas path is connected to the high-temperature oxidation section, and the third tail gas path is connected to the ultra-clean oxidation section. This system enables tail gas incineration treatment of maleic anhydride plants using the n-butane process and hydrogen cyanide plants. The incineration system is highly efficient and energy-saving, eliminating the need for SNCR or SCR denitrification devices and ensuring low nitrogen emissions from the flue gas.

The present application relates to a kind of acrylonitrile by-product acetonitrile high-efficiency recovery preparation system and process, belong to acetonitrile recovery technical field.The system includes HCN removal unit, extraction rectification dehydration unit, solvent recovery unit and finished product refining unit, in the feed line upstream of HCN removal unit, additional pre-separation unit.The pre-separation unit is preferably cyclone flash tank, for pre-separation after preheating coarse acetonitrile raw material liquid, obtain gas phase material rich in hydrogen cyanide and liquid phase material with reduced hydrogen cyanide content.The liquid phase material is sent to HCN removal tower, and the gas phase material is directly incorporated into the overhead vapor system of HCN removal tower.The cyclone flash tank is provided with a rotating inner cylinder driven by fluid, with helical blade, and a conical reverse pushing component and water removal component, to realize efficient gas-liquid cyclone separation.The present application solves the technical problems of high energy consumption, limited system processing capacity and poor stability of HCN removal unit in existing acetonitrile refining process.

The invention provides a composite roll core cigarette filter tip and a preparation method thereof, the filter tip is of an integral structure formed by winding and thermally bonding a flexible aerogel sheet and an electrostatic spinning film deposited on the surface, the flexible aerogel sheet has high porosity and is loaded with a ZIF-8 at AC porous adsorption material, and the composite roll core cigarette filter tip can be used as a cigarette filter tip. The electrostatic spinning membrane is used for efficiently adsorbing tar, polycyclic aromatic hydrocarbon and small-molecular harmful substances in smoke, the electrostatic spinning membrane has a large specific surface area loaded CeO2-MnO2 catalyst and can catalytically degrade carbon monoxide, hydrogen cyanide, aldehyde ketone compounds and free radicals, the contact path of the smoke and a functional material is prolonged through the adsorption-catalysis synergistic effect and the winding type multi-stage pore channel design, and the adsorption efficiency of the functional material is improved. The comprehensive filtering efficiency of harmful substances is improved, and meanwhile, good mechanical strength and proper suction resistance are kept.

This invention belongs to the field of catalytic ammonia oxidation technology, and specifically relates to a Ru / AMn2O4 catalyst for the gas-solid phase synthesis of methacrylonitrile, its preparation method, and its application. The catalyst preparation includes the preparation of an AMn2O4 spinel support, AMn2O4 spinel support pretreatment, and Ru / AMn2O4 catalyst preparation. The catalyst of this invention, prepared by the above method, possesses advantages such as high activity at low temperature, high stability, high conversion rate of methacrolein, high yield of methacrylonitrile, and low yield of the byproduct hydrogen cyanide. It is particularly suitable for use as a catalyst in the gas-solid phase ammonia oxidation of methacrolein to methacrylonitrile.

The invention discloses transition metal modified tobacco harm-reducing particles as well as a preparation method and application thereof. The harm-reducing particles are prepared from the following components in parts by weight through granulation and drying: 8-10 parts of tobacco raw material powder, 3-15 parts of an adsorbent, 2-20 parts of cellulose, 0.5-5 parts of a humectant, 0.1-1.5 parts of an adhesive, 3-20 parts of a wetting agent and 0.9-44 parts of a transition metal modifier. The preparation process of the harm-reducing particles comprises the steps that tobacco raw materials are subjected to heat treatment and superfine grinding to obtain tobacco raw material powder, the tobacco raw material powder and raw materials except the transition metal modifier are mixed and granulated to obtain semi-finished particles, finally, the transition metal modifier is evenly sprayed to the surfaces of the semi-finished particles, and drying is conducted to obtain the harm-reducing particles. The harm-reducing particle filter stick prepared from the harm-reducing particles provided by the invention greatly reduces harmful substances in smoke while ensuring the flavor of the smoke, and through detection, the harm-reducing particle filter stick has a more excellent harm-reducing effect compared with a cellulose acetate tow filter stick in the prior art, and especially for hydrocyanic acid, the harm-reducing effect can be reduced by 72%.

This invention discloses a synergistic catalyst, its preparation method, and its application, belonging to the field of polymer materials technology. The synergistic catalyst of this invention constructs a core-shell structure and introduces specific catalytic elements, while simultaneously controlling the size and density of the product. When this product is applied to the production of acrylonitrile and hydrogen cyanide, it is not only fully compatible with existing fluidized bed process systems, but also has low operation difficulty and simple process, and the acrylonitrile and hydrogen cyanide produced have high yields, and the output ratio can be controlled according to actual needs.