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西维因(sevin,化学名为甲基氨基甲酸—1—萘酯)是一高效低毒的宽谱杀虫剂。在西维因产品中,往往含有少量的异构体甲基氨基甲酸—2—萘酯,经动物实验证实,它会引起鼠类眼睛的白内瘴症和恶性肿瘤;西维因则否,对脊椎动物的毒性也不甚剧烈(鼠类的允许口服量LD50为560mg/kg)。西维因技术产品质量直接与所用的中间体1-萘酚或1-萘磺酸的纯度有关。用催化方法直接将原料萘转变成1-萘酚,其中不含有2-萘酚,借磺化方法先将萘转变成1-萘磺酸,由于工艺条件所限,其中必含有一定量的副产物2-萘磺酸,虽经纯化,也难于将它除净。用这种不纯的1—萘磺酸来生产的1—萘酚,其中也就含有与之相应的2—萘酚,因而影响西维因技术产品的质量。
Sevin, a chemical known as 1-naphthyl methylcarbamate, is a broad spectrum insecticide with high potency and low toxicity. In the West Vitamin product, it often contains a small amount of 2-naphthyl methyl iscarboxylate, confirmed by animal experiments, it will cause mouse eye leukoplanetases and malignant tumors; The toxicity of vertebrates is also not very severe (mice allowed oral LD50 560mg / kg). The quality of the CIVIL technical products is directly related to the purity of the 1-naphthol or 1-naphthalene sulfonic acid used as intermediate. By catalytic method, the raw material naphthalene is directly converted into 1-naphthol, which does not contain 2-naphthol. First, naphthalene is converted to 1-naphthalenesulfonic acid by the method of sulfonation. Due to the limited process conditions, a certain amount of The product 2-naphthalene sulfonic acid, although purified, is also difficult to remove. The 1-naphthol produced with this impure 1-naphthalenesulfonic acid also contains 2-naphthol corresponding thereto, thus affecting the quality of the Civiwine technical product.