7results about "Nitrous acid preparation ester preparation" patented technology

The application relates to the technical field of nitrite synthesis, and discloses a synthesis method and a synthesis device of alkyl nitrite. The synthesis method comprises the following steps: firstly, mixing gaseous nitric oxide and gaseous oxygen to obtain a mixture through a first reaction; and then, mixing the mixture with alkyl alcohol to obtain alkyl nitrite through a second reaction. The synthesis method greatly shortens the reaction time, increases the yield of alkyl nitrite, does not have a complicated post-treatment process and a large amount of by-product nitric acid, and is beneficial to cost saving and time saving.

The invention relates to the field of gas-liquid reaction, in particular to a horizontal reactor and a reaction method using the horizontal reactor. The horizontal reactor is provided with a liquid-phase material inlet and a liquid-phase material outlet along the axial direction; n groups of inlet partition plates and outlet partition plates are axially arranged on the horizontal reactor to divide the horizontal reactor into n + 1 stages of reaction units, and n is an integer greater than or equal to 1; each of the n + 1 stages of reaction units is independently provided with a gas-phase material inlet, a gas distributor and a gas-phase material outlet, and a gas-phase material enters the reaction units through the gas distributors via the gas-phase material inlets. According to the horizontal reactor provided by the invention, the conversion efficiency of materials is effectively improved, the reaction time is shortened, no running part is arranged in the reactor, and the reactor is easy to seal and operate.

The invention discloses a method and a device for efficiently producing methyl nitrite. The method comprises the following steps: carrying out a reaction for generating methyl nitrite in a reaction chamber A to obtain a liquid-phase material, and transferring nitric acid out of the liquid-phase material in the reaction chamber A through an acid transfer concentration device; wherein the liquid-phase material after the nitric acid is transferred serves as a reaction raw material and is reused in the reaction chamber A; transferring the transferred nitric acid into a reaction chamber B; when the mass concentration of the nitric acid in the reaction chamber B is larger than or equal to a first set value, the reaction of converting the nitric acid into methyl nitrite is carried out in the reaction chamber B; when the mass concentration of the nitric acid in the reaction chamber B is less than or equal to a second set value, stopping the reaction for generating the methyl nitrite; the first set value is greater than the second set value. According to the device and the method, oxidative esterification and nitric acid conversion reaction can be simultaneously carried out, methyl nitrite is efficiently produced, the total space-time yield of the product is improved, and the process energy consumption and cost are reduced.

The invention relates to the field of gas-liquid reaction, and discloses a circulation reaction device and a reaction method using the circulation reaction device. The circulation device comprises at least one stage of circulation reactor, the circulation reactor comprises a cylinder body and a guide cylinder arranged in the cylinder body, and an annular space is formed between the cylinder body and the guide cylinder; the loop reactor is provided with a liquid-phase material inlet, a gas-phase material inlet and a gas distributor, and a gas-phase material enters the guide cylinder through the gas distributor via the gas-phase material inlet. Gas-phase materials are sprayed into the guide cylinder to form air lift, liquid is pushed to circularly flow along the guide cylinder, meanwhile, liquid-phase series feeding and gas-phase parallel feeding of all stages of reactors are achieved, it is effectively guaranteed that the materials in all stages of reactors react under the optimal process condition, the gas-liquid contact effect and the mass transfer effect are improved, and the material conversion efficiency is remarkably improved.

This utility model belongs to the technical field of syngas-to-ethylene glycol process technology, specifically relating to an apparatus for preparing methyl nitrite based on fuming nitric acid, including a booster compressor and a NO... x The generator / absorption tower and nitric acid reduction reaction tower, booster compressor and NO x The bottom gas inlet of the generator / absorber is connected to NO. x The generator / absorber is connected to the nitric acid feed pipe and the demineralized water feed pipe. The top liquid inlet of the nitric acid reduction reaction tower is connected to the bottom liquid pipeline of the esterification tower and the NO... x The bottom liquid phase outlet of the generator / absorption tower is connected, and the bottom gas phase inlet of the nitric acid reduction reaction tower is connected to the NO. x The top gaseous outlet of the generator / absorber is connected. This invention uses fuming nitric acid as raw material to react and obtain NO and nitric acid, which are then reacted with the methyl ester-containing bottom liquid of the esterification tower to generate methyl nitrite, which is then supplied to the esterification tower. This achieves the replenishment of methyl nitrite, simplifies the nitrogen replenishment operation of the syngas to ethylene glycol production system, reduces operational risks, and lowers costs.

The present invention relates to a novel method of synthesizing mononitrosylated and dinitrosylated propanediols and novel compositions and pharmaceutical formulations comprising said compounds. The method is carried out by reacting the corresponding non-nitrosylated propanediol with a source of nitrite, optionally in the presence of a suitable acid. Therein, when the source of nitrite is an organic nitrite, the reaction step is performed in a suitable organic solvent and when the source of nitrite is an inorganic nitrite, the reaction step is performed in a biphasic solvent mixture comprising an aqueous phase and a non-aqueous phase. The present invention further relates to methods of treating conditions in which the administration of nitric oxide (NO) has a beneficial effect, by administering said compounds, compositions or formulations.

Described is a process for the synthesis of mono- and bis-nitrosylated propanediols, as well as compositions and pharmaceutical formulations that includes the compounds. The process proceeds by reacting a corresponding propanediol that is not nitrosylated with a source of nitrite, optionally in the presence of a suitable acid. When the source of nitrite is an organic nitrite, reacting step is performed in a suitable organic solvent, and when the source of nitrite is an inorganic nitrite, the reacting step is performed in a bi-phasic solvent mixture comprising an aqueous phase and a non-aqueous phase. Also disclosed are methods of treating a condition wherein administration of nitric oxide (NO) has a beneficial effect by administering said compounds, compositions or formulations.