Synthetic process of heavy metal chelating agent

The invention belongs to the technical field of chelating agents, and in particular relates to a synthetic process of a heavy metal chelating agent. The method comprises the following steps: firstly, diluting organic amine for 2-10 times by using organic solvents; secondly, adding the enough amount of carbon disulfide into the diluted organic amine by controlling the reaction temperature to be between 30 and 50 DEG C to obtain an intermediate product; and thirdly, adding hydroxide powder into the intermediate product and stirring, performing solid-liquid separation to obtain the heavy metal chelating agent. Compared with the prior art, by reducing the concentration of organic amine, the intense degree of the reaction can be effectively reduced, so that the reaction temperature is increased. A test proves that the quality of the product has no difference from that of the previous product when the temperature is controlled to be between 30 and 50 DEG C; therefore, under a normal condition, normal production can be met by using common circulating water, so that equipment facilities such as refrigerating units for cooling are eliminated, the labor intensity of operation personnel is also reduced, and the cost is greatly reduced.