Pentafluoropropionic acid CAS 422-64-0

A kit for tandem mass spectrometry detection, comprising an extract and a mobile phase, and optionally comprising one or more of a quality control standard, an isotope standard of a target analyte, and a derivatization reagent, wherein the extraction The liquid is an aqueous methanol solution with a concentration of 85-95% by volume, and the mobile phase is a mixture comprising water, acetonitrile and pentafluoropropionic acid, wherein the volume ratio of water, acetonitrile and pentafluoropropionic acid is 70-90:15-25 :0.15-0.25. The application also provides the using method and application of the kit.

A method for enhancing natural gas recovery and its product production process. It includes ethylene glycol perfluoropropionate aerosol, and ethylene glycol perfluoropropionate aerosol includes the following raw material reagents: ethylene glycol HOCH2CH2OH, pentafluoropropionic acid CF3CF2COOH, p-toluenesulfonic acid, ethanol recrystallization and Sodium carbonate solution; ethylene glycol HOCH2CH2OH, pentafluoropropionic acid CF3CF2COOH and p-toluenesulfonic acid are all of analytical grade. The design of this invention eliminates the liquid lock, capillary resistance, and reduces the resistance of natural gas output; secondly, it improves the gas phase permeability, increases the volume of the gas phase flow channel, increases the output of natural gas, and improves the low Effective well production yield, so that the intermittent and into a normally open well, improve the natural gas single well production and ultimately enhance the natural gas recovery.

CN201711177618.5 discloses a preparation method of cobalt neodecanoate. Cobalt neodecanoate is one of the main adhesion promoters for bonding between steel wire and rubber, and is mainly used for radial tires, conveyor belts, steel flat steel coils, etc. The initial bonding of metal and rubber in rubber hose and other composite materials ensures the performance and service life of the tire, and at the same time ensures that the late rubber can still have a high viscosity retention rate after aging and corrosion. Therefore, cobalt neodecanoate has been Become an indispensable component in the production of rubber-metal composite materials. The preparation method comprises the following steps: 1) metathesis reaction: cobalt hydroxide, methyl acetate, p-xylene, vinyl formic acid, methacrylic acid and neodecanoic acid are mixed and reacted, and after the reaction is completed, a mixture of cobalt neodecanoate is obtained ; 2) redox reaction: add aliphatic acid, 2-ethylhexanoic acid in the cobalt neodecanoate mixture that obtains, after the reaction is completed, replace the methyl acetate in the cobalt neodecanoate mixture, obtain intermediate product 3) Vacuum water removal treatment: add triethanolamine and pentafluoropropionic acid to the obtained intermediate product, and after the reaction is finished, remove methyl acetate and impurities through a vacuum filtration removal device to obtain cobalt neodecanoate; 4) Finished product: add cobalt carbonate and polyurethane to the cobalt neodecanoate obtained as described above; the cobalt neodecanoate prepared by the cobalt neodecanoate preparation method has strong adhesion and aging resistance High, good self-stability advantages.

CN200710014026.1 discloses a method for detecting the dissolution of memantine hydrochloride-related preparations, specifically using a high-performance liquid chromatography-evaporative light scattering detector, and using methanol-0.05% pentafluoropropionic acid solution as the mobile phase. Take 6 units of memantine hydrochloride-related preparations, use 100ml of 0.1mol/l hydrochloric acid solution as solvent, and after 30 minutes, take an appropriate amount of the solution and filter it as the test solution. Take another reference substance and add water to make a 0.1mg/ml solution as the reference substance solution. Take 20 μl of each of the two solutions, inject them into the liquid chromatograph, and record the chromatograms. The dissolution rate of memantine hydrochloride was calculated by the peak area according to the external standard method. The invention overcomes the disadvantages that memantine hydrochloride is relatively stable in structure and difficult to effectively detect without absorption in the ultraviolet region, and can accurately detect the dissolution rate of memantine hydrochloride in its related preparations using simple mobile phase conditions, and has the advantages of simplicity and rapidity. , Accurate advantages.

CN201880068626.2 provides a dry etching method, which is characterized in that a mixed gas containing hydrogen fluoride and fluorine-containing carboxylic acid is brought into contact with silicon nitride at a temperature less than 100°C and without plasma, and the silicon nitride is etched. The amount of the fluorine-containing carboxylic acid is preferably 0.01% by volume or more of the total amount of the hydrogen fluoride and the fluorine-containing carboxylic acid. Examples of the fluorine-containing carboxylic acid include monofluoroacetic acid, difluoroacetic acid, trifluoroacetic acid, difluoropropionic acid, pentafluoropropionic acid, pentafluorobutyric acid and the like. This dry etching method can etch silicon nitride at a high etching rate, has a high selectivity to silicon oxide and polysilicon, and can suppress damage to silicon oxide.