Lawu na gaw PAPI . hpe shapraw ai lam re.
PAPI (crude MDI) hpe MDI hte maren sha galaw shapraw ai hta lai nna, aniline a n-gun hte hydrochloric acid gaw kaji ai. PAPI hte MDI zawn re ai ni hpe shingdaw ai lam hpe lahkam lahkawng. Shawng, aniline hte formaldehyde hparan ladat (formalin) hpe Lewis acid langai a npu e diamine langai mi lawm ai polyamine mixture de shinggyin la ai. PAPI{3}} polyamine compounds ni hpe shingdaw ai hta, phosgenation reaction hpe phosgenation reaction hku nna hkam la ai. aniline hte formaldehyde a ratio gaw 1:75, synthesized polyamine n-gun hta 50% daram rai nga ai. Dai majaw, raw material group garan ginhka ai shadawn shadang, madung hku nna, aniline hte formaldehyde a n-gun a shadawn shadang gaw 1.6 to2.}} a 1990 ning hta byin ai galai shai ai lam ni a shadawn shadang, polyamine synthesis a matu kaga bungli galaw ai masa ni hte bung ai. MDI hte PAPI galaw ai lam ni hpe galaw shapraw ai lam a matu ra ai polyamine gaw 60% kaw nna 75% du hkra lawm ai polyamine compound langai mi rai ra ai, ahkyak ai lam hpe mung, aniline hte formaldehyde charge galaw da ai arung arai. a shadawn shadang hpe galai shai ai hku nna lu la ai. polyamine hta diamine compound 75% daram lawm ai. Kalang lang, MDI hte PAPI hpe co-production galaw ai lam hpe hkap la ai.