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Thermal polymerization of aspartic acid modified

Author: MaHong
Tutor: YangShiLin
School: Heilongjiang University
Course: Inorganic Chemistry
Keywords: Polyaspartic acid (PASP) Modification Thermal polymerization Scale Performance Inhibition Performance
CLC: TQ085.4
Type: Master's thesis
Year: 2008
Downloads: 80
Quote: 1
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Abstract


Current widespread use of corrosion inhibitor to the increasingly serious environmental harm, developed a new \Polyaspartic acid (PASP) is an excellent scale and corrosion inhibition properties of biopolymers, its biodegradability has aroused great interest and become a hot research topic. However, the current synthesis process employed abroad, there are still polluting sectors, difficult to control the molecular weight, stable performance, high production costs, can not be achieved industrial production and other problems. To solve these problems, we first proposed the thermal polycondensation of L-aspartic acid-modified to produce legitimate PASP new technology, and the technology and systematic research synthesis products. In this study, process design using modification by mechanical stirring, the reaction was heated evenly, so that product quality in appearance and color, performance and other technical indicators can be improved, and no synthetic byproducts are clean production processes. By reaction conditions on polysuccinimide (PSI) yield and PASP molecular weight and molecular weight on the scale and impact of the performance impact of experimental studies to determine the scale inhibition performance of PASP with the best weight-average molecular weight of about 3000 and The optimum operating parameters of the polymerization process, the reaction temperature is 230 ℃, reaction time 2h. Synthesized according to the process described above green corrosion inhibitor PASP, and with the current production and application of the best most widely used inhibitors polyacrylic acid (PAA) made a comparative study of the performance scale, the results show that different two-duty Scale effects are quite different, various water quality conditions, PASP have a finer scale than the PAA performance, especially high Ca2, high pH and other water quality. Simultaneously with the inhibitor hydroxyethylene diphosphate (HEDP) for corrosion performance comparison study showed that, PASP and HEDP have similar corrosion rate, but as the trial time extension, PASP shows better than the slow-HEDP corrosion performance. Through water quality conditions on PASP corrosion performance test results using the PASP optimum pH value of 5.5 to 6.5; Ca2 concentration increased water PASP enhanced inhibition effect, Fe2 concentration increased inhibition effect on PASP is not large. These findings are presented in this study synthesis scheme applied to actual production provide a strong guarantee. Finally, this paper PASP scale and corrosion inhibition mechanism was analyzed.

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