Multi-bed reaction device for preparing hydrogen by sodium borohydride alcoholysis

Abstract

The invention discloses a multi-bed reaction device for preparing hydrogen by sodium borohydride alcoholysis. The multi-bed reaction device comprises a sodium borohydride storage tank, a flow controller, a sprayer, a catalyst reaction bed, a heat exchanger and a product recovery tank; the sodium borohydride storage tank is used for storing an alkaline sodium borohydride methanol solution; the flow controller is used for adjusting the flow velocity and flow rate of the solution; the sprayer is arranged at the top of the hydrogen production reaction tank; the catalytic reaction bed comprises at least two layers of catalyst reaction beds; the heat exchanger is used for regulating and controlling the temperature of the reaction tank. The product recovery tank is placed at the bottom of the reaction tank to collect the reactants sodium tetramethylborate for following recovery and reuse. The multi-bed reaction device is capable of improving the utilization rate of the reactants and realizing the precise control over hydrogen production quantity. The contact of the reactants with the catalyst is expanded, the liquid-solid separation is more thorough, the influence of concentration difference gradient is eliminated, furthermore the catalyst utilization rate is improved, and the cost of precious metal is reduced.

Description

technical field [0001] The invention belongs to the technical field of fuel cell reaction devices, and relates to a multi-bed reaction device, in particular to a multi-bed reaction device for hydrogen production by alcoholysis of sodium borohydride. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a new type of power generation device that directly converts chemical energy in fuel and oxidant into electrical energy. The preferred power source for automobiles, mobile electronic equipment and communication base stations. [0003] At present, the performance of fuel cell vehicles is close to the level of traditional gasoline vehicles. The world's major automobile companies are scrambling to launch commercial fuel cell vehicles to seize the future market of electric vehicles. So far, there are nearly a thousand fuel cell vehicles in the world. Demonstration run. With the support of the Ministry of Science and Technology and governments at all levels,...

AI Technical Summary

Problems solved by technology

Most of the remaining hydrogen production units use a single fixed-bed reactor, which has the problems of incomplete hydrogen production reaction, difficult liquid-solid separation, and discontinuous hydrogen production.

In addition, the hydrolysis of sodium borohydride (alcohol) to produce hydrogen is an exothermic reaction, and the large amount of heat accumulated in the continuous reaction will cause the temperature of the reaction solution to rise or boil (methanol boiling point: 64.7°C, water: 100°C), which increases the controllable yield. The difficulty of hydrogen, and the consequent increase in the pressure in the container, seriously affects the safety of equipment and personal

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