2 results about "Tetramethylammonium bromide" patented technology

The present application relates to the technical field of synthesis of 4,4'-diaminobenzene sulfonanilide, and provides a synthesis method of 4,4'-diaminobenzene sulfonanilide with high yield, S1, p-acetylamino benzene sulfonyl chloride and p-phenylenediamine are mixed, the pH is adjusted to 7.5-8.0, under the action of a catalyst, an amide reaction is performed to obtain a mixture; S2, the mixture is added to an alkaline solution, after hydrolysis, decolorization, filtration, the pH is adjusted to 7.5-8.0, and filtration is performed to obtain 4,4'-diaminobenzene sulfonanilide; in step S2, the catalyst comprises tetrabutylammonium bromide and a catalytic aid in a mass ratio of 4:1-1.5, and the catalytic aid comprises tetraethylammonium bromide and phenyltrimethylammonium bromide in a mass ratio of 5:0.5-1. Through the technical scheme, the problem of low yield of 4,4'-diaminobenzene sulfonanilide in the related art is solved.

This invention belongs to the field of photoelectrochemical energy storage technology, specifically relating to a bromine-modified iron-bromine photoelectrochemical redox flow battery and its preparation method. The battery device of this invention comprises an anode cell, a PBVO electrode as the anode, a cathode cell, a graphite carbon felt electrode as the cathode, and a proton exchange membrane. A proton exchange membrane is fixed between the anode and cathode cells using a metal clamp. The anode cell contains a KBr solution containing tetraethylammonium bromide (TEAB) as the anolyte, and the cathode cell contains a FeCl3 solution as the cathode electrolyte. A light source illumination window is provided at the corresponding position of the anode, with backlighting. The anode includes conductive glass and a semiconductor thin film thereon. The anode is connected to the positive terminal of the power supply via a current collector, and the cathode is connected to the negative terminal of the power supply via a current collector. Compared with traditional systems, this invention's device has higher coulombic efficiency, and the charge / discharge mode can be switched by changing the photoanode, making it applicable to the field of photoelectrochemical redox flow batteries.