CAJ | 학술논문

抽采瓦斯气分离产物特性精确获取是水合分离新技术应用关键。针对两种浓度构成的瓦斯混合气（CO2-CH4-N2），利用瓦斯水合分离产物 Raman 测试装置，原位合成两种水合物样品并观测 Raman 光谱。基于客体分子振动模式、“松笼-紧笼”模型及Raman谱带面积比，结合van der Waals-Platteeuw模型，确定出水合物晶体结构，计算出晶体孔穴占有率、水合指数等结构参数。结果表明，两种瓦斯水合物样品均为Ⅰ型结构，其大孔穴占有率分别为98．57％和98．52％，小孔穴占有率分别为29．93％和33．87％，小孔穴不易被客体分子填充；两种分离产物水合指数比较接近，分别为7．14和6．98，均大于Ⅰ型水合物水合指数理论值。
추채와사기분리산물특성정학획취시수합분리신기술응용관건。침대량충농도구성적와사혼합기（CO2-CH4-N2），이용와사수합분리산물 Raman 측시장치，원위합성량충수합물양품병관측 Raman 광보。기우객체분자진동모식、“송롱-긴롱”모형급Raman보대면적비，결합van der Waals-Platteeuw모형，학정출수합물정체결구，계산출정체공혈점유솔、수합지수등결구삼수。결과표명，량충와사수합물양품균위Ⅰ형결구，기대공혈점유솔분별위98．57％화98．52％，소공혈점유솔분별위29．93％화33．87％，소공혈불역피객체분자전충；량충분리산물수합지수비교접근，분별위7．14화6．98，균대우Ⅰ형수합물수합지수이론치。
Accurate determination of coal mine gas separation product characteristics is the key for gas separation application based on hydrate technology.Gas hydrate was synthesized from two types of gas compositions (CO2-CH4-N2 ).The separa-tion products were measured by in situ Raman spectroscopy.The crystal structure of mixed-gas hydrate was determined,and the cavity occupancy and hydration index were calculated,based on the object molecular various vibrational mode,“loose cage-tight cage”model and the Raman bands area ratio,combined with the model of van der Waals-Platteeuw.The results show that the mixed-gas hydrates are both structureⅠ for the two gas samples;Large cages of mixed-gas hydrate are nearly occupied by guest molecules,and the large cavity occupancies are 98. 57% and 98. 52%,respectively;but small cages are not easy to be occupied, and the small cavity occupancies are 29. 93% and 33. 87%,respectively;hydration index of the two gas samples hydrate is 7. 14 and 6. 98,respectively,which is greater than the theoretical value of structure Ⅰ.