Dimer Acid Production Byproduct - Monomer Acid Deep Processing

Monomer acid as raw material,which was the byproduct of dimer acid from one of chemical plantds in China,was used to produce biodiesel and rolling oil additives.First,the chemical constituents of fatty acid in monomer acid were determined by GC/MS.Fifteen fatty acids were predominated:myristic acid(12.16%),palmitic acid(8.51%),stearic acid(32.72%),and oleic acid(23.37%).Meantime,the physicochemical properties of monomer acid were researched.The conclusion showed that iodine value was 80gI₂/100g,acid value was 180mgKOH/g,saponification value was 192mgKOH/g,and water was 0.05%.Second,carrying out monomer acid and methanol as raw materials to study the acid-catalyzed process technology of biodiesel.And, p-toluenesulfonic acid was used to catalyze methyl esterification of monomer acid.At the same time,with the parameter esterification ratio,single factor and orthogonal experiment,the highest conversion was achieved when the mole ratio of methanol to monomer acid was 3:1 with addition of 6%p-toluenesulfonic acid and reacted at 60℃for 3h. Under these conditions,98.25%of methyl esterification product was obtained.Its properties reached to that of 0^# diesel oil.At last,synthetic ester and momomer acid were tested as oiliness additives.The compatibility between additives and base oil was study. The effects of mixed ratio were base oil 95%～99%,antioxidant 0.08% and oil additives 1%～5%.The rolling oil performance indices were comprehensively evaluated taking the following five performances as the indices:lubrication,shrinkage reducing,tribological propert,annealing property and anti-oxidation.The results showed that viscosities were between 1.9mm²/s and 2.1mm²/s,interface tensions were between 30.7mN/m and 31.90mN/m,annealing performances were inside level two,load-carrying capacities were above 245N,friction coefficients were less than 0.01 and aluminum surface roughness were less than 0.063μm. It can fully meet the demand of aluminum rolling industry.