Study And Process Optimization Of Selective Hydrogenation Of 1,4-butynediol With Raney-Ni

1,4-Butanediol is an important basic organic raw material with the characteristics of high added value and wide application.It is often used in medicine,textiles,and military industries.Polyurethane and polybutylene succinate in its downstream products can be used to prepare biodegradable plastics,which is of great significance to environmental protection.At present,the industrial production of 1,4-butanediol still has the problems of harsh process conditions and low selectivity.In this paper,1,4-butynediol is used as a raw material to prepare 1,4-butanediol by catalytic hydrogenation.The effects of catalyst type and amount,solvent type,substrate concentration,reaction time,reaction temperature,reaction pressure and other factors on the reaction process were investigated respectively.The Raney nickel catalyst was applied to tank reactors and fixed bed reactors to explore the optimal reaction conditions.In the tank reactor,when choosing water as solvent,reacting 2 h under 100°C and 2.0 MPa hydrogen pressure,the conversion of 1,4-butynediol can achieve 100%,with a 1,4-butanediol selectivity of90.6%.The catalyst can be recycled 5 times,assuming that the catalyst maintains good catalytic performance.In a fixed bed reactor,the reaction still selecte the reaction as solvent,reacting under 100°C and 2.0 MPa hydrogen pressure with a space velocity of 0.91 h^-1 and a400 ratio of hydrogen to oil.The conversion rate was 99.8%,and the selectivity of1,4-butanediol was 78.9%.According to the experimental results,using Aspen Plus,a high-purity 1,4-butanediol production process was designed.The simulated scale is an annual output of 100,000 tons of1,4-butanediol.Through the optimization of a series of process parameters such as the number of feed trays,the number of theoretical trays,and the number of extractant feed trays,as well as the detailed design of the rectification tower,the conversion rate is 99.8%;1,4-Butanediol has a selectivity of 98%and a purity of 99.81%.The research results can provide a certain scientific basis for the industrial application of 1,4-butanediol.