摘要:
A composition comprising (A) 1,1,2,2,3-pentafluoropropane(CF2HCF2CFH2) and (B) at least one hydrofluorocarbon selected from the group consisting of 1,1,1,3,3-pentafluoropropane (CF3CH2CF2H) and 1,1,1,2,2,3,3,4,4-nonafluorobutane (CF3CF2CF2CF2H) is described. The composition is useful as a refrigerant and may be used in chillers as a replacement for refrigerant R-11.
摘要:
There is provided a method of producing a mixed metal compound comprising at least Mg2+ and at least Fe+ having an aluminium content of less than 10000 ppm, having an average crystal size of less than 20 nm (200 A) comprising the steps of: (a) combining a Mg2+ salt and a Fe3+ salt with Na2CO3 and NaOH to produce a slurry, wherein the pH of the slurry is maintained at from 9 5 to 1 1, and wherein the Na2CO3 is provided at an excess of 0 to 4.0 moles than is required to complete the reaction (b) subjecting the slurry to mixing under conditions providing a power per unit volume of 0 03 to 1.6 kW/m3 (c) separating the mixed metal compound from the slurry, to obtain a crude product having a dry solid content of at least 10 wt % (d) drying the crude product either by (i) heating the crude product to a temperature of no greater than 150° C. and sufficient to provide a water evaporation rate of 0.05 to 1 5 kg water per hour per kg of dry product, or (H) exposing the crude product to rapid drying at a water evaporation rate of 500 to 50000 kg water per hour per kg of dry product.
摘要翻译:提供一种生产包含至少具有小于10000ppm的铝含量的Mg 2+和至少Fe +的混合金属化合物的方法,其平均晶体尺寸小于20nm(200),包括以下步骤:(a )将Mg2 +盐和Fe3 +盐与Na 2 CO 3和NaOH组合以产生浆料,其中浆料的pH保持在9 5至11,并且其中提供的Na 2 CO 3的过量比0至4.0摩尔 需要完成反应(b)在提供每单位体积0 03至1.6kW / m 3的功率的条件下使浆料混合(c)从混合物中分离混合的金属化合物,以获得具有干燥固体的粗产物 至少10重量%的含量(d)通过以下步骤干燥粗产物:(i)将粗产物加热到不高于150℃的温度,并且足以提供0.05至15kg水的水蒸发速率 小时/ kg干燥产物,或(H)将粗产物暴露于快速干燥 每小时每千克干燥产品的水蒸发速率为500-500千克水。
摘要:
A tandem quadrupole-based mass spectrometer including a highly efficient intermediate fragmentation stage. The disclosed fragmentation stage employs collision-induced dissociation (CID), in an electrodynamic focus device, which may be a quadrupole operated in a broad band filter mode. The disclosed CID process occurs at low energy (e.g., less than 1 keV, but preferably 2 eV to 100 eV), and is quite different from the high energy (e.g, greater than 1 keV, and typically 3 keV to 10 keV) CID process in prior tandem instruments such as mass-analyzed ion kinetic energy spectrometry (MIKES) systems. The efficiency of the present CID fragmentation is as high as 65%.
摘要:
There is provided a method of producing a mixed metal compound comprising at least Mg2+ and at least Fe+ having an aluminium content of less than 10000 ppm, having an average crystal size of less than 20 nm (200 A) comprising the steps of: (a) combining a Mg2+ salt and a Fe3+ salt with Na2CO3 and NaOH to produce a slurry, wherein the pH of the slurry is maintained at from 9 5 to 1 1, and wherein the Na2CO3 is provided at an excess of 0 to 4.0 moles than is required to complete the reaction (b) subjecting the slurry to mixing under conditions providing a power per unit volume of 0 03 to 1.6 kW/m3 (c) separating the mixed metal compound from the slurry, to obtain a crude product having a dry solid content of at least 10 wt % (d) drying the crude product either by (i) heating the crude product to a temperature of no greater than 150° C. and sufficient to provide a water evaporation rate of 0.05 to 1 5 kg water per hour per kg of dry product, or (H) exposing the crude product to rapid drying at a water evaporation rate of 500 to 50000 kg water per hour per kg of dry product.
摘要翻译:提供一种生产包含至少具有小于10000ppm的铝含量的Mg 2+和至少Fe +的混合金属化合物的方法,其平均晶体尺寸小于20nm(200),包括以下步骤:(a )将Mg2 +盐和Fe3 +盐与Na 2 CO 3和NaOH组合以产生浆料,其中浆料的pH保持在9 5至11,并且其中提供的Na 2 CO 3的过量比0至4.0摩尔 需要完成反应(b)在提供每单位体积0 03至1.6kW / m 3的功率的条件下使浆料混合(c)从混合物中分离混合的金属化合物,以获得具有干燥固体的粗产物 至少10重量%的含量(d)通过以下步骤干燥粗产物:(i)将粗产物加热到不高于150℃的温度,并且足以提供0.05至15kg水的水蒸发速率 小时/ kg干燥产物,或(H)将粗产物暴露于快速干燥 每小时每千克干燥产品的水蒸发速率为500-500千克水。
摘要:
The invention relates to improvements in a diver's semi-closed circuit breathing apparatus and is intended to better control the partial pressure of oxygen during descent and ascent. Such apparatus includes a counterlung, sources of oxygen and inert gas, an oxygen regulator, a mass flow jet in the oxygen circuit, a regulator for the inert gas, and a feed-back controlled laminar flow element for feeding a mixture of the oxygen and inert gas to a counterlung of the breathing apparatus. The improvement comprises the provision of an oxygen accumulator in the oxygen circuit following the mass flow jet so that a portion of the delivered oyxgen is diverted thereto during descent to counteract oxygen partial pressure overshoot. At constant depth the apparatus operates normally, maintaining appropriate oxygen partial pressure, and, during ascent, oxygen is returned from the accumulator to the breathing apparatus to counteract any drop in oxygen partial pressure.