The method comprises heating up the lactic acid solution to gasify at 150-200 degree C, mixing the obtained mixed vapour of lactic acid and water with the carrier gas, entering into gas-solid catalytic reactor to get the reaction product gas by the action of a modified Y zeolite molecular sieve catalytic agent and dewatering after heating up the mixed gas to 200-450 degree C, obtaining the propenoic acid solution through gas-liquid dissociation after cooling the reaction product gas, obtaining coarse propenoic acid products form the propenoic acid solution by gas stripping, azeotropic distillation, extraction and rectification in turns.
其特征在于将乳酸水溶液加热至150～200℃气化得到的乳酸-水混合蒸气与载气混合，将混合后的气体继续加热到200～450℃后进入气-固相催化反应器中经改性Y沸石分子筛催化剂作用脱水得反应产物气体，反应产物气体冷却后经气液分离得到丙烯酸溶液，丙烯酸溶液再依次经过气提、共沸蒸馏或萃取、精馏得到粗丙烯酸产品。
The results show in the lower atmosphere, the cooling rate of the water vapour e-type absorption of window region is less than that of non - window region and is about 1/3 of the total water vapour cooling rate.
结果表明，在大气低层窗区e型吸收的冷却率小于非窗区的水汽冷却率，约占总冷却率的1／3；
Using the heat of welding to vapour water, cooling rates are lowered on the weld bead and heat - affected zone.
利用焊接时的加热使水汽化，不仅使焊道而且使热影响区的冷却速度减慢。
Combining with the vapour-cycling cooling system and the air-cycling cooling system, the paper puts forward an engineering plan for pod thermal design. The analysis of heat-load and the solving method of environmental control system in complicated environment is presented.
结合蒸气循环制冷系统和空气循环制冷系统，提出了工程化的吊舱热设计方案，给出了复杂飞行环境中的热载荷分析，对吊舱环控系统设计中的关键问题阐述了实现方法。
As the key component of the vapour ejector heat pump and cooling system, the vapour ejector plays an important role.
作为蒸汽喷射式热泵/制冷系统的核心部件，蒸汽喷射器对系统的运行状况影响显著。
The key to improve distilling effect lies in increasing the cooling area, decreasing inert gas pressure and installing the effective vapour-liquid separator.
针对本装置，提高蒸馏效果的关键在于增大冷凝面积，降低残气压力和装设有效的汽液分离器。
Combined with practical engineering, the several key problems concerning the vapour exhausting system for CCMS secondary cooling chamber were discussed and analyzed in this paper.
本文结合工程设计实践，对连铸机二冷室排蒸汽系统中的几个关键问题进行了分析。
Under some circumstances, the effect of the forcing and the greenhouse effect of increasing water vapour in a warmer atmosphere can overwhelm the negative feedback of the longwave cooling to space as temperature increases.
在一定条件下，随温度的增加，辐射强迫和温暖大气中增加的水汽的温室效应的正反馈可以大大地超过向空间的长波冷却的负反馈，从而产生失控增暖。
Vapour can be changed into liquid by cooling.
蒸气可以通过冷却变成液体。
This water vapour rises, condenses on cooling, and falls as rain.
水蒸汽升入空中，遇冷凝成雨滴而下降。
AN INVESTIGATION ON PWR REFLUX CONDENSATION CHARACTERISTICS A Study of a Device to Condense Water Vapour with Return Cooling System
压水堆冷凝回流特性的研究回流式冷凝排雾器的研制