Separation of glycolic acid from glycolonitrile hydrolysate using adsorption technology

Effect of Pore Size Distribution and Amination on Adsorption Capacities of Polymeric Adsorbents

“…Figure 5 shows the adsorption kinetic curves of the three adsorbates on NDA-2 and NDA-3. Phenol rapidly reached equilibrium in approximately 0.5 h, ABS acid reached equilibrium in approximately 8 h, and RBB4 reached equilibrium in approximately 20 h. The kinetics of the different adsorbates varied because the adsorption process on the inner surface of the resin is often very fast, and is mainly controlled by internal diffusion into the resin pores [ 23 ]. Owing to the relative size of the resin pores and the molecular size of phenol, the diffusion of phenol at the resin pore interface is similar to molecular diffusion in which there is free diffusion and a relatively high diffusion rate.…”

Glycolic Acid Production from Ethylene Glycol via Sustainable Biomass Energy: Integrated Conceptual Process Design and Comparative Techno-economic–Society–Environment Analysis

“…As the simplest α-hydroxy acid, GA could also be used in chemical cleaning, daily chemicals, biodegradable materials, and the pharmaceutical industry. − The GA market was 310.4 million USD in 2020 and was projected to reach 531.5 million USD by 2027, at a potential compound annual growth rate of 8.0% . Chemical synthesis is the primary GA production method. , It is of great industrial significance to develop a green GA production process to produce biodegradable and environmentally friendly biomass source plastics to replace nonbiodegradable and petrochemical plastics, targeting a sustainable low carbon footprint.…”

“…DuPont first created this technology, which requires operation conditions with high temperature and pressure . In China, GA’s industrial production commonly uses the hydrolysis of glycolonitrile process because there are technical barriers in the carbonylation of formaldehyde process . However, the hydrolysis of glycolonitrile process has the disadvantages of low mass purity of the target product (mostly 70 wt %) and severe environmental pollution .…”

“…12 Chemical synthesis is the primary GA production method. 13,14 It is of great industrial significance to develop a green GA production process to produce biodegradable and environmentally friendly biomass source plastics to replace nonbiodegradable and petrochemical plastics, targeting a sustainable low carbon footprint.…”

“…22 In China, GA's industrial production commonly uses the hydrolysis of glycolonitrile process because there are technical barriers in the carbonylation of formaldehyde process. 13 hydrolysis of glycolonitrile process has the disadvantages of low mass purity of the target product (mostly 70 wt %) and severe environmental pollution. 14 Furthermore, it is challenging to achieve high-purity production due to the HCN contained in GA products, which seriously hinders its application in high-end markets.…”