The Effect Of Catalyst On The Liquefaction And Application Of Biorefinery Industrial Waste

Based on the limited reserves of fossil energy and the sustainable development of human society,it is gradually becoming the focus of global research to seek new resources which can replace fossil resources to provide chemical raw materials.In this thesis,biorefinery industrial waste,corn stalk residue after convertion to bioethanol,was used as the raw material,and three different types of acid were used as the catalyst respectively.Three different kind of bio-polyols,which can used as the alternatives of industrial polyether polyols derived from fossil resources,were prepared,and then used to replace industrial polyether polyol to prepare polyurethane foams.The corn stalk residue was used as the raw material and the phosphotungstic acid,sulfosalicylic acid,sulfuric acid was used as the catalyst,respectively.The effect of the liquefied reagent ratio,liquefaction temperature,liquid-solid quality ratio,the dosage of catalyst and liquefaction time on the properties of the liqufied product were investigated.The results showed that the optimal liquefaction conditions when phosphotungstic acid was used as the catalyst were:PEG400/EC of 8:2,liquefaction temperature of 160 ?,liquid to solid mass ratio of 5:1,the dosage of phosphotungstic acid catalyst of 0.2 g,liquefaction time of 75 min.The liquefied product's hydroxyl number was 225.64 mgKOH/g,the residue content was 10.19%and the viscosity was 496 mPa-s in this conditions.And the optimal liquefaction conditions when sulfosalicylic acid was used as the catalyst were:PEG400/EC of 7.5:2.5,the liquefaction temperature of 160 ?,liquid to solid mass ratio of 5:1,the dosage of sulfosalicylic acid of 4 g,liquefaction time of 60 min.This liquefied product's hydroxyl number was 315.64 mgKOH/g,the residue content was 4.49%in this conditions.And,the optimal liquefaction conditions when concentrated sulfuric acid was used as the catalyst were:PEG400/EC of 7:3,liquefaction temperature of 160 ?,liquid to solid mass ratio of 5:1,the dosage of catalyst of 1.5 g,liquefaction time of 60 min.This liquefied product's hydroxyl number was 302.99 mgKOH/g and the residue content was 2.61%in this conditions.And then,these three bio-polyols with excellent properties were used to replace part of industrial polyether polyols to prepare the polyurethane foam.Meanwhile,the effect of the dosage of triethylamine,the dosage of water,R value,the dosage of stannous octoate and the replacement percent of bio-polyols on the properties of polyurethane foam were studied,respectively.The results showed that the optimal foaming conditions when PTA-BIRP was used to replace industrial polyether polyols as follows:the dosage of triethylamine was 0.25g,the doasge of water was 0.3 g,R value was 1.2,the dosage of stannous octoate was 0.2 g.The initial decomposition temperature,compressive strength and the apparent density of 10%PTA-BIRP modified polyurethane foam were 280?,42.44 kPa and 0.06217 g/cm3,respectively.All of these three parameters are lower than those of polyurethane foam without modification by PTA-BIRP.The optimal foaming conditions when SSA-BIRP was used to replace industrial polyether polyols as follows:the dosage of triethylamine was 0.25 g,the doasge of water was 0.35 g,R value was 1.2,the dosage of stannous octoate was 0.2 g.the replacement percent of bio-polyols was 90%.The initial decomposition temperature,compressive strength and the apparent density of polyurethane foam were 214?,42.44 kPa and 0.06217 g/cm3,respectively.Both of the initial decomposition temperature and apparent density are lower than those of polyurethane foam without modification by SSA-BIRP,but the compressive strength has greatly improved.The optimal foaming conditions when SSA-BIRP was used to replace industrial polyether polyols as follows:the dosage of triethylamine was 0.15 g,the doasge of water was 0.3 g,R value was 1.2,the dosage of stannous octoate was 0.2 g.the replacement percent of bio-polyols was 80%.The initial decomposition temperature,compressive strength and the apparent density of polyurethane foam were 223? 105.08 kPa and 0.06116 g/cm3 in this conditions,respectively.Both of the initial decomposition temperature and apparent density are lower than those of polyurethane foam without modification by CSA-BIRP,however,the compressive strength has significantly improved.