SYNTHESIS OF DIMERCAPTOETHYL ADIPATE

• Main Author: Abdan Syakuron, Rizal
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/55358
• Institution: Institut Teknologi Bandung

Polyvinyl chloride (PVC) is a very popular type of polymer. When PVC is about to be formed into a product, PVC is extruded at 140-190oC. In the pure state, PVC is dehydrochlorinated at temperatures above 70oC, so it needs the addition of a thermal stabilizer. A popular thermal stabilizer is organotin (organic tin), because of its good performance. There are many types of organotin stabilizers, one of which is called reverse ester. This type of organotin is commonly made from colored fatty acids, so the use of this thermal stabilizer gives color to PVC. That is why this stabilizer is not suitable for use in transparent PVC products. Replacing fatty acids with adipic acid is expected to produce a colorless reverse ester stabilizer. A patent in 1953 describes the use of adipic acid and mercaptoethanol as the main ingredient to synthesize reverse ester stabilizer intermediates. But unfortunately, the information presented in this patent is not much, so this patent is interesting to study more deeply. The purpose of this research is to analyze the influence of entrainer type, scale of production, and excess of mercaptoethanol in the manufacture of intermediates according to the patent. Subsequent intermediates are called DMEA (dimercaptoethyl adipate). The main raw materials for DMEA include adipic acid and mercaptoethanol. DMEA synthesis was carried out by azeotropic distillation technique, using p-TSA catalyst. The types of entrainers used are cyclohexane and hexane. DMEA is synthesized on a scale of 100 g and 500 g adipic acid. The mercaptoethanol used was given an excess of 20% and 40%. To ensure that the DMEA was successfully synthesized, an IR, and NMR-H spectral analysis was performed on the sample. To analyze the clarity of the DMEA, the samples were compared with acetone PA using a UV-VIS spectrophotometer. To see the effect of entrainer type, scale of production, and excess of mercaptoethanol in the manufacture of intermediates, an analysis of sulfihydrile content, refractive index, density, as well as synthesis yield, reaction temperature, and reaction time were carried out.