Synthesis method and application of low-phosphorous corrosion and scale inhibitor

Abstract

The invention discloses a synthesis method and an application of a low-phosphorous corrosion and scale inhibitor. Certain amounts of diethyl phosphite and diethyl maleate are added to a reaction kettle, a certain amount of a catalyst A is slowly dropwise added under the stirring condition that the revolving speed of a stirrer is 200 r / min, the mixture reacts for 1 h at 100 DEG C and then cooled to 50 DEG C, then a certain amount of ethyl acrylate is added, the mixture reacts for 8 h, a certain amount of a catalyst B is added to the reaction kettle, the mixture is heated to 80 DEG C for hydrolysis for 0.5 h, and a yellowish-brown viscous liquid, namely, PBTCA, is obtained. When the temperature of recirculating cooling water is 40 DEG C, the dosage is 5 g / m<3>, and the scale inhibiting ratio is up to 90.70%; when the dosage is 56 g / m<3>, the corrosion inhibiting ratio is up to 81.62%, and the corrosion rate is 0.110 mm / a and meets the requirement of being lower than 0.125 mm / a in the Code for Design of Industrial Recirculating Cooling Water Treatment (GB50050-2007).

Description

1. Technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a synthesis method and application of a low phosphorus corrosion and scale inhibitor. 2. Background technology [0002] As people's awareness of environmental protection increases, more and more people pay more and more attention to low-phosphorus and phosphorus-free environmentally friendly corrosion and scale inhibitors. Corrosion and scale inhibitors such as molybdate, silicate and tungstate are due to their non-toxic Phosphorus and low toxicity are used in industrial circulating cooling water systems, but molybdate is expensive and the cost of use is high, and the corrosion and scale inhibition effect of tungstate and silicate is not ideal when used alone. PBTCA (2-phosphonic acid-1,2,4 tricarboxylic butane) is a corrosion and scale inhibitor with very low phosphorus content, and the phosphorus content in the molecule only accounts for about 11.5% of th...

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Problems solved by technology

[0004] The purpose of the present invention is aimed at the complex process route of the synthetic method of traditional PBTCA, can produce highly toxic cyanide in the reaction process, and can cause problems such as secondary pollution to the environment, with diethyl phosphite, maleic acid Diethyl ester and ethyl acrylate are used as raw materials to synthesize PBTCA under the action of catalyst

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