scholarly journals Application of Anhydrous Calcium Sulfate as a Weighting Agent in Oil-Based Drilling Fluids

ACS Omega ◽  
2021 ◽  
Author(s):  
Mobeen Murtaza ◽  
Zeeshan Tariq ◽  
Mohamed Mahmoud ◽  
Muhammad Shahzad Kamal ◽  
Dhafer Al Shehri
Keyword(s):  
Calcium Sulfate ◽  
Drilling Fluids ◽  
Anhydrous Calcium Sulfate

scholarly journals Cryopreservation of Tomato Pollen

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 797A-797 ◽  
Author(s):  
E.J. Sacks ◽  
D.A. St. Clair
Keyword(s):  
Lycopersicon Esculentum ◽  
Plant Breeding ◽  
Calcium Sulfate ◽  
Germplasm Conservation ◽  
Freezing And Thawing ◽  
Tissue Paper ◽  
Anhydrous Calcium Sulfate ◽  
Glass Tubes ◽  
Fresh Pollen

We have developed a method for cryopreserving Lycopersicon esculentum pollen to facilitate the timing of crosses and for long-term germplasm conservation. Gelatin capsules containing pollen were wrapped in tissue paper and placed in air-tight glass tubes with anhydrous calcium sulfate desiccant. Tubes containing pollen were stored at –80C. In one experiment, we stored the pollen of LA359 and T5 at –80C for 37 days. Pollen predesiccated overnight at 4C then stored at –80C, pollen put in a tube with desiccant then immediately stored at –80C, and fresh pollen were compared by pollinating 10 flowers of LA359 with each of the six pollen treatments and counting the number of seed per fruit. Average seed counts ranged from 127 for fresh, T5 pollen to 172 for predesiccated LA359 pollen. In another experiment, cryopreserved pollen of UC82B and VFNT Cherry was given from 0 to 6 cycles of freezing and thawing. Ten flowers of LA359 were pollinated with each of the 12 treatments. Average seed counts ranged from 125 to 152. The data from both experiments suggest that cryopreservation of tomato pollen to facilitate efficient plant breeding is feasible.

scholarly journals Preparation of Anhydrous Calcium Sulfate Whiskers from Phosphogypsum in H2O-H2SO4 Autoclave-Free Hydrothermal System

2017 ◽  
Vol 58 (8) ◽  
pp. 1111-1117 ◽  
Author(s):  
Hongbin Tan ◽  
Faqin Dong ◽  
Liang Bian ◽  
Xiaochun He ◽  
Jingfeng Liu
Keyword(s):  
Hydrothermal System ◽  
Calcium Sulfate ◽  
Anhydrous Calcium Sulfate ◽  
Calcium Sulfate Whiskers

Preparation of anhydrite from eggshell via pyrolysis

2018 ◽  
Vol 7 (2) ◽  
pp. 139-146 ◽  
Author(s):  
Nuchnapa Tangboriboon ◽  
Wanitcha Unjan ◽  
Watchara Sangwan ◽  
Anuvat Sirivat
Keyword(s):  
Calcium Sulfate ◽  
Pore Diameter ◽  
Raw Materials ◽  
Raw Material ◽  
X Ray ◽  
Anhydrous Calcium Sulfate ◽  
Calcium Sulfate Dihydrate ◽  
Thermal Analyzer ◽  
Infrared Spectrometer ◽  
Calcium Sulfate Hemihydrate

AbstractCalcium sulfate dihydrate (CaSO4·2H2O) was prepared from the chemical reaction between calcium carbonate from duck eggshell and sulfuric acid at 25°C. The CaSO4·2H2O was dried in an oven at 110°C and transformed into calcium sulfate hemihydrate or plaster of Paris (CaSO4·0.5H2O). The CaSO4·0.5H2O was calcined at 700, 800 and 900°C and transformed into anhydrite or anhydrous calcium sulfate (CaSO4). The raw material used in this research was the duck eggshell, the waste eggshell generated from food processing industries. The obtained anhydrous calcium sulfate or anhydrite has true density, color, specific surface area, pore diameter and particle size equal to 2.95 g/cm3, white powder, 3.57 m2/g, 96.98 Å and 3.983 μm, respectively. In addition, other characteristics, microstructures, phase transformation and physical properties of raw materials and calcium sulfates were investigated and reported here using X-ray fluorescencemeter, Fourier transform infrared spectrometer, differential thermal analyzer, thermogravimetric analysis, scanning electron microscope, X-ray diffractometer, pycnometer method and Brunauer-Emmett-Teller.

Mechanism of vanadium extraction from stone coal via hydrating and hardening of anhydrous calcium sulfate

2016 ◽  
Vol 166 ◽  
pp. 48-56 ◽  
Author(s):  
Nan-nan Xue ◽  
Yi-min Zhang ◽  
Tao Liu ◽  
Jing Huang ◽  
Hong Liu ◽  
...  
Keyword(s):  
Calcium Sulfate ◽  
Stone Coal ◽  
Anhydrous Calcium Sulfate ◽  
Vanadium Extraction

Mechanism of Inorganic-organic Surface Modification of Anhydrous Calcium Sulfate Whisker

2017 ◽  
Vol 32 (1) ◽  
pp. 81
Author(s):  
LV Zhi-Hui ◽  
HONG Tian-Zeng ◽  
NAI Xue-Ying ◽  
DONG Ya-Ping ◽  
LI Wu
Keyword(s):  
Surface Modification ◽  
Calcium Sulfate ◽  
Anhydrous Calcium Sulfate ◽  
Calcium Sulfate Whisker

Anhydrite (Calcium Sulfate) Mineral as a Novel Weighting Material in Drilling Fluids

2020 ◽  
Vol 143 (2) ◽  
Author(s):  
Mobeen Murtaza ◽  
Zeeshan Tariq ◽  
Mohamed Mahmoud ◽  
Muhammad Shahzad Kamal ◽  
Dhafer Al-Shehri
Keyword(s):  
Calcium Carbonate ◽  
Potassium Carbonate ◽  
Calcium Sulfate ◽  
Filter Cake ◽  
Chelating Agent ◽  
Fluid Loss ◽  
Drilling Fluids ◽  
Inorganic Acids ◽  
New Formulation ◽  
First Time

Abstract Different additives such as barite, calcium carbonate, hematite, and ilmenite having high-density and fine solid materials are used to increase the density of drilling fluids. However, some of the weighting additives can cause some serious drilling problems such as barite (particle settling, formation damage, erosion, and insoluble filter cake). In this study and for the first time, anhydrite (calcium sulfate) is used as a weighting additive in the drilling fluids. Several laboratory experiments such as density, rheology, fluid loss, resistivity, and pH were carried out to assess the performance of calcium sulfate as a weighting additive in the drilling fluids. The performance of calcium sulfate as a weighting additive was compared with the commonly used weight enhancing additive calcium carbonate. The results showed that calcium sulfate has higher solubility than calcium carbonate. The fluid loss test showed that both additives lost the same volume of fluid and created the same thickness of filter cake; however, the solubility of calcium sulfate-based filter cake with organic and inorganic acids was higher compared with other weighting materials. Calcium sulfate-based filter cake was completely dissolved using a new formulation that consists of glutamic-diacetic acid (GLDA) chelating agent and potassium carbonate as a convertor. The removal efficiency after 10 h reached 100% in 20 wt% GLDA and 10 wt% potassium carbonate solution at 100 °C.

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