，又稱和，化學式為(wei)NaOH，一(yi)(yi)般為(wei)白狀或顆粒，能(neng)溶(rong)于(yu)水生(sheng)成(cheng)堿(jian)(jian)性溶(rong)液(ye)，也能(neng)溶(rong)于(yu)及乙醇。具有(you)潮解(jie)性，會(hui)吸(xi)收(shou)空氣里的水蒸氣，也會(hui)吸(xi)取(qu)二氧(yang)化碳(tan)、等酸性氣體。片(pian)(pian)堿(jian)(jian)安全生(sheng)產要(yao)(yao)求：堿(jian)(jian)罐密封(feng)口要(yao)(yao)嚴(yan)密，法蘭墊片(pian)(pian)要(yao)(yao)用(yong)防腐材料(liao)，以免開裂(lie)漏堿(jian)(jian)傷人；罐區要(yao)(yao)有(you)防護(hu)堰。蒸鍋要(yao)(yao)定(ding)期檢查維護(hu)，發現(xian)問題及時修理或更換，蒸鍋要(yao)(yao)有(you)鍋蓋，片(pian)(pian)堿(jian)(jian)廠家聯系方式，防止意外事故發生(sheng)。片(pian)(pian)堿(jian)(jian)用(yong)途(tu)：廣泛用(yong)于(yu)造(zao)紙(zhi)，有(you)機合(he)成(cheng)、化工(gong)、紡織、人造(zao)絲(si)、、治金(jin)、精練(lian)石(shi)油(you)、制皂、提煉煤焦油(you)等。工(gong)業用(yong)包(bao)裝(zhuang)容器一(yi)(yi)定(ding)要(yao)(yao)有(you)明顯牢固的標志。

片堿生產工(gong)藝流(liu)程：將液(ye)(ye)堿打入(ru)液(ye)(ye)堿高位槽(cao)(cao)(cao)（罐），利用(yong)(yong)高位槽(cao)(cao)(cao)（罐）的液(ye)(ye)位差放入(ru)蒸發鍋預(yu)(yu)熱(re)，預(yu)(yu)熱(re)后(hou)用(yong)(yong)移動堿泵(beng)打入(ru)第二(er)預(yu)(yu)熱(re)鍋進一(yi)步預(yu)(yu)熱(re)。弧形堿槽(cao)(cao)(cao)靠提(ti)升裝置保持在所需的位置上或停車時能(neng)倒(dao)盡(jin)槽(cao)(cao)(cao)內熔(rong)融堿。滾筒以 1.5-3.0r/min的速度(du)緩慢轉動。冷卻水由(you)滾筒軸(zhou)承一(yi)端的中心引入(ru)，從水管上的噴嘴噴出。為(wei)白色不透明的蠟狀固體，片堿生產廠家，密(mi)度(du)為(wei)2.13?。其(qi)分(fen)子(zi)量(liang)為(wei)40.00，熔(rong)點為(wei)318?℃ (591 K)，沸點為(wei)1388?℃ (1661 K)。水中溶解(jie)(jie)度(du)為(wei)111 g/100 ml（20 ℃），片堿生產公司(si)，中溶解(jie)(jie)度(du)為(wei)238 g/L，乙醇(chun)中溶解(jie)(jie)度(du)小于(yu)139 g/L。

片(pian)(pian)堿(jian)(jian)(jian)工藝(yi)操(cao)作(zuo)(zuo)工時(shi)(shi)與(yu)生產周(zhou)期：操(cao)作(zuo)(zuo)工時(shi)(shi)；備料(liao)時(shi)(shi)間(jian)：20分(fen)鐘；蒸煮時(shi)(shi)間(jian)：4.5小時(shi)(shi)；片(pian)(pian)堿(jian)(jian)(jian)工藝(yi)生產周(zhou)期：從備料(liao)到生產出(chu)固體共6小時(shi)(shi)。片(pian)(pian)堿(jian)(jian)(jian)是液(ye)堿(jian)(jian)(jian)在(zai)高溫(wen)下進一(yi)步濃縮呈熔融狀，再(zai)經冷卻(que)、成(cheng)(cheng)型，片(pian)(pian)堿(jian)(jian)(jian)，制(zhi)成(cheng)(cheng)不同(tong)形狀的固堿(jian)(jian)(jian)的一(yi)種。（槽(cao)底部(bu)可用燒煤、燒油或燒其它可燃氣體進行保(bao)溫(wen)，槽(cao)內 液(ye)面可用行程開(kai)關(guan)或溢(yi)流裝(zhuang)置控(kong)制(zhi)）鋼(gang)(gang)鐵材料(liao)在(zai)堿(jian)(jian)(jian)洗溶(rong)液(ye)中會發(fa)生堿(jian)(jian)(jian)脆，堿(jian)(jian)(jian)脆具(ju)有(you)應(ying)力腐蝕(shi)的特征(zheng)。碳(tan)鋼(gang)(gang)在(zai)片(pian)(pian)堿(jian)(jian)(jian)溶(rong)液(ye)中易(yi)于(yu)出(chu)現應(ying)力腐蝕(shi)的敏感區域。片(pian)(pian)堿(jian)(jian)(jian)的堿(jian)(jian)(jian)性較弱，其腐蝕(shi)性也(ye)較弱。