China
Africa
Explore chapters and articles related to this topic
Inorganic scale
Published in Jon Steinar Gudmundsson, Flow Assurance Solids in Oil and Gas Production, 2017
The methodology illustrated above for barium sulphate, can be used for both calcium sulphates and strontium sulphate. The mineral celestite is also called celestine. The gypsum chemical balance includes water, called crystal water. Another calcium sulphate that contains crystal water is hemihydrate, having one-half water molecule per CaSO4 $ _{4} $ . Calcium sulphates are not common inorganic scales in oil and gas production.
Application of response surface methodology to absorptive separation of SO2 from its mixture with air using marble waste
Published in Chemical Engineering Communications, 2020
Lokesh Kumar, Susanta Kumar Jana, Dipaloy Datta
Reactions involved in the absorption of SO2 in the MARWAS slurry are considered to be very similar to those occurring in the desulfurization of flue gases using limestone slurry. The overall reaction of SO2 with the marble slurry in a bubble column reactor may be represented as Equation (1): The main reaction steps (Nannen et al., 1974; Ma et al., 2000) may be summarized by Equations (2–9) as follows.Mass transfer of SO2: Hydrolysis of SO2: Dissolution of CaCO3: Formation of Calcium sulfite: Calcium sulfate hemihydrate: Calcium sulfate dihydrate: Carbon dioxide: A small amount of MgCO3 present in MARWAS also reacts with the absorbed SO2:
Influence of polysulfonates on the properties of β-calcium sulfate hemihydrate and its hydration
Published in Journal of Dispersion Science and Technology, 2023
Xinyu Meng, Pingping Zhou, Xueyi Hu, Jianyi Liu, Yongmei Xia
It is well known that calcium sulfate hemihydrate eventually forms dihydrate through multiple setting stages during the hydration process.[32,33]Figure 7 showed the effect of the polymers on the setting times and consistency of β-H. Obviously, PAS-1 and PAS-2 have a retarding effect on the hydration process of β-calcium sulfate hemihydrate (Figure 7a-b) although they both contain sulfonate groups which can accelerate the initial hydration process.