CAJ | 학술논문

以SAPO-34分子筛为催化剂,在固定流化床装置上研究了丁烯裂解的反应规律和结焦规律.实验结果表明,反应温度对丁烯裂解产物分布影响较大,丁烯转化率、乙烯和丙烯收率均随反应温度的升高而增加,乙烯和丙烯总选择性(双烯选择性)随反应温度的升高先增加后降低,适宜的反应温度为580-600 ℃;延长停留时间可提高丁烯转化率及乙烯和丙烯总收率(双烯收率),但停留时间过长会增加二次反应,降低乙烯、丙烯的选择性,尤其是丙烯;水蒸气对丁烯裂解有一定的促进作用,可使丙烯收率明显增加.与ZSM-5分子筛相比,SAPO-34分子筛的稳定性较差,但双烯选择性较高,在运行初期可获得与ZSM-5分子筛相当的双烯收率.SAPO-34分子筛催化丁烯裂解时,在运行初期及高温下生焦速率快,积碳显著影响SAPO-34分子筛的酸性.
이SAPO-34분자사위최화제,재고정류화상장치상연구료정희렬해적반응규률화결초규률.실험결과표명,반응온도대정희렬해산물분포영향교대,정희전화솔、을희화병희수솔균수반응온도적승고이증가,을희화병희총선택성(쌍희선택성)수반응온도적승고선증가후강저,괄의적반응온도위580-600 ℃;연장정류시간가제고정희전화솔급을희화병희총수솔(쌍희수솔),단정류시간과장회증가이차반응,강저을희、병희적선택성,우기시병희;수증기대정희렬해유일정적촉진작용,가사병희수솔명현증가.여ZSM-5분자사상비,SAPO-34분자사적은정성교차,단쌍희선택성교고,재운행초기가획득여ZSM-5분자사상당적쌍희수솔.SAPO-34분자사최화정희렬해시,재운행초기급고온하생초속솔쾌,적탄현저영향SAPO-34분자사적산성.
Cracking and coking of butene on SAPO 34 molecular sieve catalyst were investigated in a fixed fluidized bed reactor. High temperature(580-600 ℃) was required for butene cracking. Conversion of butene, and total yield of ethylene and propylene increased with temperature raising,but total selectivity to ethylene and propylene showed a maximum with temperature. Appropriate residence time was required for butene cracking in order to obtain high conversion and total yield of ethylene and propylene. Addition of a proper amount of water was preferable to butene cracking to obtain ethylene and propylene, especially the latter. In comparing with ZSM 5 catalyst, although total selectivity to ethylene and propylene on SAPO 34 catalyst was high, stability lowered. The total yield of ethylene and propylene on SAPO 34 catalyst at initial stage of butene cracking was comparable with that on ZSM 5 catalyst. The deposition of coke on SAPO 34 catalyst was observed to be fast at initial stage and high temperature. The acidity of SAPO 34 catalyst reduced obviously along with coke deposition.