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Biomass Chemical Engineering ›› 2023, Vol. 57 ›› Issue (5): 8-16.doi: 10.3969/j.issn.1673-5854.2023.05.002

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Conversion of Bamboo Pulp to 5-Chloromethylfurfural in a Diluted HCl-chloride System

Guitong NONG1, Weiwei HAO1, Zheng LI1, Xing TANG1, Hongcai ZHOU2, Lu LIN1,*()   

  1. 1. College of Energy, Xiamen University, Xiamen 361102, China
    2. Guangdong Zhongke Tianyuan New Energy Science & Technology Co., Ltd., Guangzhou 510535, China
  • Received:2022-11-15 Online:2023-09-30 Published:2023-10-07
  • Contact: Lu LIN E-mail:lulin@xmu.edu.cn

Abstract:

5-Chloromethylfurfural(CMF) was a biobased platform compound that had received considerable attention in recent years. The traditional CMF preparation process required a concentrated hydrochloric acid system, and its high corrosivity remained as a challenge to its scale-up production. To solve this problem, a reaction system based on acidic CaCl2 solution was established, and the influence of reaction conditions, material concentration and other parameters on the preparation of CMF from bamboo biomass in this system was studied. The results showed that saturated or nearly saturated chloride ion in the water phase could effectively inhibit the hydrolysis of CMF to HMF, thereby improving the stability of CMF in the system, and thus reducing the conversion of unstable intermediate products(i.e., HMF) to humins under acidic conditions. CaCl2 had excellent catalytic performance in the system, and the highest CMF yield of 59.2% was obtained. 1, 2-Trichloroethane, 1, 3-dichloropropane, 1, 2, 3-trichloropropane and other solvents with higher boiling point had the potential to replace extractant of 1, 2-dichloroethane(DCE). The effects of different pretreatment conditions on CMF yield of bamboo pulp were further studied, and the optimal hydrolysis chlorination conditions were: initial bamboo pulp mass concentration of 16 g/mL, 8 g of H2O, 1.33 mol/L of HCl, 5.33-6.66 mol/L of CaCl2, 130 ℃, 1 h and 25 mL of DCE. Under these conditions, the CMF yield was 59.2%, and bamboo pulp samples pretreated by NaHSO3 or Cooking with Active Oxygen and Solid Alkali(CAOSA) method were more better for CMF preparation than those of treated with traditional alkali methods. The acidic CaCl2 phase could be recycled and then reused after supplementing a certain amount of HCl. The conversion of bamboo pulp to CMF was scaled up by 15 times and provided the CMF yield of 51.8%. The CMF crude product had good stability in dichloroethane solution, and there was no significant deterioration after 4-12 days of storage.

Key words: biomass, bamboo pulp, CaCl2, 5-chloromethylfurfural

CLC Number: