催化重整装置中苯和硝化级甲苯的规格要求很严,初馏点与终馏点之差要小于1℃,相邻芳烃的含量要求小于0.1％,所以苯塔和甲苯塔塔顶温度不能采用一般的温度控制。要求这样高精度的仪表,以前在我国还是一个空白点,而工业生产上又十分需要。广东仪表厂于1976年11月研制成功 The specifications of benzene and nitration grade toluene in the catalytic reforming unit are very strict. The difference between the initial boiling point and the final boiling point is less than 1 ℃, and the content of adjacent aromatic hydrocarbons is less than 0.1%. Therefore, the temperature of benzene column and toluene column overhead can not Adopt general temperature control. Requirements of such a high-precision instruments, previously in our country is still a blank point, and industrial production is also very much needed. Guangdong Instrument Factory in November 1976 successfully developed