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Development and Performances of an Environmentally Friendly Corrosion Scale Inhibitor

Author: ChenZuo
Tutor: YangHongGang
School: Wuhan University of Technology
Course: Environmental Engineering
Keywords: Polyaspartic acid Synthesis Scale Corrosion Biodegradable
CLC: TQ085.4
Type: Master's thesis
Year: 2010
Downloads: 97
Quote: 0
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Abstract


Chemical treatment of circulating cooling water in industry for several decades of practical experience. With the rapid development of industry, water treatment chemicals, put forward higher requirements. The new water treatment chemicals, scale inhibitor, corrosion and double performance has been the efforts of the workers in the direction of the water treatment chemicals. With the progress of society and the human awareness of environmental protection, the development and application of scale and corrosion inhibitor more and more attention to the environmental requirements. Only those who are not contaminated or quickly biodegradable, inexpensive and efficient and environment-friendly scale and corrosion inhibitor, truly welcomed by the people of the new water treatment chemicals. Polyaspartic acid (PASP) belongs to a class of polyamino acids, and from the consideration of environmental compatibility and biodegradability makes it particularly valuable in the treatment agent. The use of polyaspartic acid can be effectively and stably by microorganisms, fungi and degradation of the final product is harmless to the environment. This paper studies the maleic anhydride and ammonium carbonate as raw materials, optimizing the reaction conditions, the polyaspartic acid (PASP) synthesis, and test its scale and corrosion inhibition performance. Polyaspartic acid in the study based on its scale and corrosion inhibition mechanism as the main body, mixed with other agents, and to determine the best ratio, developed a polyaspartic acid-based environment-friendly scale and corrosion inhibitor to explore factors affecting pharmacy scale and corrosion inhibition performance the primary biodegradability evaluation of complex products. The following conclusions: (1) Synthesis of polyaspartic acid optimal synthesis conditions: maleic anhydride and ammonium carbonate (NH2) of the molar ratio of 1:1.2, the amount of catalyst 1.5mL polymerization temperature 180 ℃, polymerization time of 0.5h. Better repeatability of the experiment, the optimum conditions has a certain universality, in line with the synthesis requires; (2) polyaspartic acid has good resistance of CaCO3 scale and CaSO4 scale performance, optimal dosing concentration of 6 mg / L and 2mg / L, can be applied to high calcium ion concentration in the water system, better temperature performance, long-running in the high-temperature water system is still better scale performance; (3) measured by TEM CaCO3 and CaSO4 dirt-like crystal form, the results show that the polyaspartic acid can damage the lattice structure of CaCO3 and CaSO4, destruction of the lattice the normal growth pattern of, changing the orderly arrangement of the lattice, the grain tends to refinement, scale becomes loose easy to fall off; (4) design with polyaspartic acid, sodium gluconate, Zn2 adsorption, chelation, deposition of composite pharmaceutical formulations. The results showed that both scale inhibition of polyaspartic acid 50 mg / L, sodium gluconate 80 mg / L, Zn2 2 mg / L of environment-friendly scale and corrosion inhibitor, the double effect of corrosion inhibition, inhibition rate reached 90.15 %, the corrosion rate of 85.47%; (5) The primary biodegradation degree of shaking culture method complex products. The results show that polyaspartic acid is easily biodegradable organics, ZN2 added does not inhibition produced of polyaspartic biological degradation, it can increase its initial biodegradation.

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical plant > Industrial water,water treatment > Water treatment
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