石油学报（石油加工）
石油學報（石油加工）
석유학보（석유가공）
Acta Petrolei Sinica (Petroleum Processing Section)
2015年
5期
1069-1074
,共6页
拟薄水铝石%偏铝酸钠%二氧化碳%碳酸化%连续中和%连续成胶
擬薄水鋁石%偏鋁痠鈉%二氧化碳%碳痠化%連續中和%連續成膠
의박수려석%편려산납%이양화탄%탄산화%련속중화%련속성효
pseudo-boehmite%sodium meta-aluminate%carbon dioxide%carbonation%continuous neutralization%continuous precipitation
采用NaAlO2‐CO2连续中和方式制备拟薄水铝石，研究了连续中和‐母液老化和连续中和‐净水老化2种工艺的规律，探讨了不同中和pH值、老化方式、老化温度以及老化时间对产物性质的影响。采用XRD、BET、XRF、T EM等手段表征了产物的晶相、相对结晶度、晶粒尺寸、孔结构、比表面积、杂离子含量以及晶粒的形貌和堆积方式。结果表明，连续中和与间歇中和工艺反应规律相似，但连续中和工艺更易生成丝钠铝石；采用连续中和‐净水老化工艺可有效避免丝钠铝石的生成；随着中和 pH 值下降，拟薄水铝石晶粒堆积更加致密，其焙烧所得γ‐A l2 O3的孔容和比表面积均有所降低，最可几孔直径增大。
採用NaAlO2‐CO2連續中和方式製備擬薄水鋁石，研究瞭連續中和‐母液老化和連續中和‐淨水老化2種工藝的規律，探討瞭不同中和pH值、老化方式、老化溫度以及老化時間對產物性質的影響。採用XRD、BET、XRF、T EM等手段錶徵瞭產物的晶相、相對結晶度、晶粒呎吋、孔結構、比錶麵積、雜離子含量以及晶粒的形貌和堆積方式。結果錶明，連續中和與間歇中和工藝反應規律相似，但連續中和工藝更易生成絲鈉鋁石；採用連續中和‐淨水老化工藝可有效避免絲鈉鋁石的生成；隨著中和 pH 值下降，擬薄水鋁石晶粒堆積更加緻密，其焙燒所得γ‐A l2 O3的孔容和比錶麵積均有所降低，最可幾孔直徑增大。
채용NaAlO2‐CO2련속중화방식제비의박수려석，연구료련속중화‐모액노화화련속중화‐정수노화2충공예적규률，탐토료불동중화pH치、노화방식、노화온도이급노화시간대산물성질적영향。채용XRD、BET、XRF、T EM등수단표정료산물적정상、상대결정도、정립척촌、공결구、비표면적、잡리자함량이급정립적형모화퇴적방식。결과표명，련속중화여간헐중화공예반응규률상사，단련속중화공예경역생성사납려석；채용련속중화‐정수노화공예가유효피면사납려석적생성；수착중화 pH 치하강，의박수려석정립퇴적경가치밀，기배소소득γ‐A l2 O3적공용화비표면적균유소강저，최가궤공직경증대。
Continuous neutralization‐aging in mother solution process and continuous neutralization‐aging in deionized water process for pseudo‐boehmite preparation were investigated .The effects of neutralization pH value , aging mode , aging temperature , and aging time on the properties of prepared pseudo‐boehmite were investigated .XRD ,BET ,XRF ,TEM were applied to analyze the crystal form , crystallinity , crystal particle size , pore structure , specific surface area , impurity ions ,morphology and packing form of crystal particles of products .The results showed that the pattern of continuous neutralization was similar to batch neutralization , but with a larger probability of dawsonite formation .Continuous neutralization‐aging in deionized water process was better for avoiding the dawsonite formation .Rod‐like particles of prepared pseudo‐boehmite were more closely packed ,and the pore volume and specific surface area of γ‐Al2 O3 obtained from pseudo‐boehmite calcination deceased ,and its most probable pore diameter increased with the decrease of neutralization pH value .
