Ni-P-mCMC/mCS双极膜的制备及在电合成糠醇中的应用

Preparation of Ni-P-mCMC/mCS Bipolar Membrane and Its Application in Electro-Generation of Furfural Alcohol

以磷酸化试剂改性羧甲基纤维素钠和戊二醛改性壳聚糖制备了Ni-P-mCMC/mCS双极膜并用于电还原制备糠醇。测定了膜的离子交换容量及膜的交流阻抗;以化学镀方法将金属镍镀在阳离子交换膜层的表面上,以实现阴极室中的零极距电解。双极膜中间层中水解离后生成的H+离子迁移入阴极室中,使阴极室呈酸性,从而保证了糠醛电还原生成糠醇的进行。实验结果表明,以糠醛水溶液为阴极液,1mol/LH2SO4为阳极液,常温电解,电流效率可达84%,电解电压2.5V。与传统的液相中压或高压加氢法相比,避免了Cu-Cr催化剂所产生的铬污染,为绿色环保工艺。

Ni-P-mCMC/mCS bipolar membrane （BPM） was prepared by carboxymethyl cellulose （CMC） and chitosan（CS）, which were modified by phosphorylated agent and glutaraldehyde （GA）, respectively. The ion exchange capacity of mCMC, mCS membrane and the AC impedence were investigated. Nickel was plated down to the surface of mCMC cation membrane to realize zero polar distance electrolysis in the cathode. H＋ generated by BPM moves into the cathodic chamber in time from mCMC layer to supplement H＋ consumed in the electro- reducation process of furfural for generating furfural alcohol; The experimental results show that furfural alcohol is prepared by electro-reduction of furfural in the cathode room. The current efficiency is up to 84% at room temperature, and the electrolysis voltage is as low as 2.5V. In comparison with the traditional method, the electroreduction technology saves the Cu-Cr catalyzer and eliminates the chromium pollution to the environmento