69 results about "METHYLIODIDA" patented technology

An improved method of producing acetic acid includes condensing overhead vapor from a light ends column and decanting the condensed vapor to a light phase and a heavy phase. The heavy phase consists predominantly of methyl iodide and at least a portion of the decanted heavy phase is refluxed to the light ends column. Acetic acid content of the light ends column overhead stream and water content of the light ends column product (sidedraw) stream are both decreased, improving purification efficiency.

A process for producing acetic acid while efficiently separating permanganate reducing compounds (PRC's) and methyl iodide is provided. PRC's are separated or removed from a mixed composition (3A) containing PRC's and methyl iodide by distilling the mixed composition in a distillation step (5) to form an overhead stream (5A), a side-cut stream (5B), and a lower stream (5C). In a distillation column of the distillation step (5), an extractant (e.g., water) extracting PRC's preferentially to methyl iodide is added to a concentration zone in which PRC's and methyl iodide are concentrated, and an extraction mixture falling from the concentration zone is withdrawn as the side-cut stream (5B).

The disclosure relates to a process in which methanol is carbonylated in a reaction zone in the presence of a catalyst to obtain a reaction mixture (A) comprising acetic acid, hydrogen iodide, methyl iodide, water and the catalyst. At least a part of the reaction mixture (A) is withdrawn from the reaction zone. The withdrawn part of the reaction mixture (A) is introduced into a flash zone where it is brought into contact with an alkylimidazolium iodide to form a secondary mixture (B), and where the secondary mixture (B) is separated to obtain a vapor stream (BV) which comprises the acetic acid, water and methyl iodide, and a liquid stream (BL) which comprises the catalyst, the alkylimidazolium iodide and hydrogen iodide. The vapor stream (BV) is processed to purify the acetic acid, and the liquid stream (BL) is recycled to the reaction zone. The reaction mixture (A) is brought into contact with the alkylimidazolium iodide in the flash zone1) by introducing to the flash zone separately from the withdrawn part of the reaction mixture (A) an extraneous alkylimidazolium iodide; or2) by introducing to the flash zone separately from the withdrawn part of the reaction mixture (A) an alkylimidazole and forming the alkylimidazolium iodide in situ by reacting the alkylimidazole with the hydrogen iodide or the methyl iodide.

The invention belongs to the field of solar cells, in particular to an organic-inorganic hybrid perovskite solar cell. Bromine-doped methylamine-lead-iodide perovskite solar cell, the photosensitive layer of the solar cell is a bromine-doped methylamine-lead-iodide perovskite CH 3 NH 3 PB 3‑x Br x thin film, made from methylamine iodide CH 3 NH 3 I. Lead iodide PbI 2 After mixing, dissolve in N,N-dimethylformamide DMF and dimethyl sulfoxide DMSO mixed solvent to form CH 3 NH 3 PB 3 The perovskite precursor liquid is then made by spin-coating, cleaning process combined with multi-step atmosphere annealing process. in CH 3 NH 3 PB 3‑ x Br x In the film, the bromine content x has a value between 0.2 and 0.6. The invention also relates to a method for making the battery.

Provided is an acetic acid production method that enables, in a scrubbing system, efficient separation and obtaining of methyl iodide and an absorbing solvent; restrainment of corrosion of the interior of a distillation column; efficient separation between and recovery of hydrogen iodide and methyl iodide; or sufficient recovery of hydrogen iodide. The acetic acid production method according to the present invention includes a first absorption step and a second absorption step. In the first absorption step, an offgas is brought into contact with a first absorbent to allow the first absorbent to absorb an iodine compound from the offgas, to give a first gas, where the first absorbent includes at least one of C2 or higher alcohols, esters of C3 or higher carboxylic acids, esters between carboxylic acids and C2 or higher alcohols, ethers, ketones, water, and basic aqueous solutions. In the second absorption step, the first gas is brought into contact with a second absorbent to allow the second absorbent to absorb an iodine compound from the first gas, where the second absorbent includes at least one of C2 or higher alcohols, esters of C3 or higher carboxylic acids, ethers, esters between carboxylic acids and C2 or higher alcohols, ketones, water, basic aqueous solutions, and acetic acid and differs in composition from the first absorbent.

The invention relates to a class of red light aggregation-induced luminescent materials, in particular to a thieno[3,4-b]thiophene-based aggregation-induced luminescent material and a preparation method and application thereof. The light-emitting material uses triphenylamine and thieno[3,4-b]thiophene as core units, and uses 4-(4-(bis(4-methoxyphenyl)amino)phenyl)-6-methylthio Thieno[3,4-b]thiophene-2-carboxylic acid ethyl ester and 1,4-dimethylpyridinium iodide salt synthesis (E)-4-(2-(4-(4-(bis(4- methoxyphenyl)amino)phenyl)-2-(ethoxycarbonyl)thieno[3,4-b]thiophen-6-yl)vinyl)-1-methylpyridinium iodide salt, then dissolved in Acetone is added, and an aqueous solution of potassium hexafluorophosphate is added, and the material is prepared after the reaction. The fluorescence emission of the material is located in the near-infrared region, and the fluorescence brightness is strong, and can be used as a red light material in the imaging field.

The invention aims to provide a dynamic distribution system of gaseous methyl iodine. The dynamic distribution system comprises a small-flow liquid supply device, a liquid vaporization chamber and an air compressor, wherein the small-flow liquid supply device is fixed on a bracket; an outlet of the small-flow liquid supply device is arranged in alignment with an inlet of the liquid vaporization chamber; the liquid vaporization chamber is arranged on a pedestal through a threaded supporting rod and a lifting threaded bushing which is matched with the threaded supporting rod; the angle of the liquid vaporization chamber can be adjusted through the lifting threaded bushing; an air suction port is formed below the liquid vaporization chamber; a hole which is connected with the air compressor is formed above the liquid vaporization chamber; an electric heating device is also arranged in the liquid vaporization chamber; and the air compressor is communicated with a gas application environment. According to the dynamic distribution system, long-time continuous stable supply of the small-flow methyl iodine liquid can be realized, and stable concentration of the methyl iodine at the outlet of the system is guaranteed. The suction effect of the air compressor enables that the liquid vaporization chamber is in a negative pressure state all the time; safety and reliability are guaranteed; and no injury is caused to the environment and the operation personnel. The system has the advantages of simple structure, reliable performance and easiness for implementation.