关键词: 重整催化剂, 铂分散度, 氢氧吸附法, 氧氯化段, 温度, 氧含量, 注氯量, 水氯摩尔比

Abstract:

Platinum dispersion is an important factor affecting the activity of catalytic reforming catalyst. The platinum dispersion of reforming catalyst is generally measured by hydrogen-oxygen adsorption method. Due to high temperature and moisture atmosphere, the platinum on the catalyst will accumulate and the chlorine components will be lost, which leads to the deactivation of catalyst. After carbon burning of the deactivation catalyst, it is oxidized and chlorinated to supplement the chlorine, and disperse platinum crystal particles, and restore the catalyst activity. The oxychlorination stage conditions are key factors in restoring platinum dispersion. By adjusting the reaction severity, the carbon deposition is increased from 3.0%～3.5% to over 4.0%. Increase the temperature at the inlet of the second charring stage from 480 ℃ to more than 490 ℃, and the bed temperature of the oxychlorination stage is increased from 480～490 ℃ to more than 510 ℃. The oxygen volume fraction at the outlet of the second charring stage is reduced from 0.35% to 0.30% to improve the air distribution in the oxychlorination stage, and the oxygen volume fraction in the oxychlorination stage is remained above 5.8%. According to the catalyst circulation rate, the chlorine injection increases from 2,000 μg/g to 2,600 μg/g. The molar ratio of water to chlorine is controlled to 5～6. The platinum dispersion of the reforming catalyst is increased from 70% to more than 85%.

Key words: reforming catalyst, platinum dispersion, hydrogen oxygen adsorption method, oxychlorination stage, temperature, oxygen content, the amount of chlorine injection, molar ratio of water to chlorine