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                                                                                                                                                                                                                1. 歡迎光臨氯化鈣廠家濰坊壽光晨隆鹽化有限公司官方網站! 設為首頁 | 加入收藏
                                                                                                                                                                                                                  熱門搜索:  氯化鈣    工業鹽  as  無水氯化鈣
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                                                                                                                                                                                                                  濰坊壽光晨隆鹽化有限公司
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                                                                                                                                                                                                                  氯化鎂當前位置: 網站首頁 > 產品展示 > 氯化鎂 >

                                                                                                                                                                                                                  無水氯化鎂

                                                                                                                                                                                                                  無水氯化鎂
                                                                                                                                                                                                                   

                                                                                                                                                                                                                  無水氯化鎂

                                                                                                                                                                                                                  理化性質
                                                                                                                                                                                                                  氯化鎂純品為無色單斜結晶,工業品通常呈黃褐色,有苦咸味。容易吸濕,溶于水100℃時失去2分子結晶水。常溫下其水溶液呈中性。在110℃開始失去部分氯化氫而分解,強熱轉為氧氯化物,當急速加熱時約118℃分解。其水溶液呈酸性熔點118℃(分解,六水),712℃(無水)。
                                                                                                                                                                                                                  沸點:1412℃(無水)
                                                                                                                                                                                                                  水合的氯化鎂加熱時失水和氯化氫部分生成氯化氫和堿式氯化鎂。
                                                                                                                                                                                                                   
                                                                                                                                                                                                                  主要用途
                                                                                                                                                                                                                  1、固化劑;營養強化劑;呈味劑(與硫酸鎂、食鹽、磷酸氫鈣、硫酸鈣等合用);日本清酒等的助酵劑;除水劑(用于魚糕,用量0.05%~0.1%);組織改進劑(與聚磷酸鹽類合用,作為魚糜制品的彈性增強劑)。因苦味較強,常用量小于0.1%;
                                                                                                                                                                                                                  2、小麥粉處理劑;面團質量改進劑;氧化劑;魚肉罐頭改質劑;麥芽糖化處理劑。
                                                                                                                                                                                                                   
                                                                                                                                                                                                                  制備方法
                                                                                                                                                                                                                  1、由海水制鹽時的副產物鹵水,經濃縮成光鹵石(KCl·MgCI·6H2O)溶液,冷卻后除去氯化鉀,再濃縮、過濾、冷卻、結晶而得。 氧化鎂或碳酸鎂用鹽酸溶解、取代而得。 無水氯化鎂由氯化鎂銨加熱脫氨而得。 
                                                                                                                                                                                                                  2、無水氯化鎂可由氯化銨和六水合氯化鎂的混合物,或由氯化銨、六水合氯化鎂的復鹽在氯化氫氣流中脫水而制成。 將等摩爾的MgCl2·6H2O和NH4Cl溶于水,在溫度稍高于50℃的水溶液中以復鹽形式結晶出來,保持原來溫度與母液分開。再進行一次重結晶。 
                                                                                                                                                                                                                  稍加干燥趁熱裝入石英舟中,將舟放在石英管中進行脫水操作,通入干燥的氯化氫氣體,同時升溫至100℃脫水3h,再升溫至250℃ 1h,然后再升溫至400℃ 1h,最后在短時間內熔融,并通CO2氣體以驅逐HCl氣體,得到的無水氯化鎂可保存在五氧化二磷的保干器中。也可將復鹽NH4Cl·MgCl2·6H2O放在真空爐內,在減壓下加熱至200℃脫水,這樣氯化氫氣體的用量可以減少。海水制鹽時的副產物鹵水,經濃縮成光鹵石(KCl·MgCl2·5H2O)溶液,冷卻后除去氯化鉀,再濃縮、過濾、冷卻、結晶而得。氧化鎂或碳酸鎂用鹽酸溶解、取代而得。無水氯化鎂由氯化鎂銨加熱脫氨而得。

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