Process embodiments for producing high grade coke and fuel grade coke from residual oil comprises: introducing the residual oil and a first paraffinic solvent having a carbon number C.sub.n to a first solvent deasphalting unit to produce a high quality deasphalted oil (HQDAO) fraction and a first asphalt fraction; passing the HQDAO fraction to a delayed coker to produce green coke; passing at least a portion of the first asphalt fraction and a second paraffinic solvent carbon number of C.sub.n+1 to a second solvent deasphalting unit to produce a low quality deasphalted oil (LQDAO) fraction and a second asphalt fraction; and passing the LQDAO fraction to the delayed coker to produce the fuel grade coke.

A method of estimating a surface tension of coal includes subjecting a surface tension, a physical property value representing a coal rank, and a total inert content of each of different brands of coal to multiple regression analysis to determine in advance a regression equation including the surface tension of coal as an objective variable and the physical property value and the total inert content as explanatory variables; and measuring the physical property value and the total inert content of a coal of which the surface tension is to be estimated, and calculating the surface tension of the coal with the measured physical property value and the measured total inert content, and the regression equation.

A method of estimating a surface tension of coal includes subjecting a surface tension, a physical property value representing a coal rank, and a total inert content of each of different brands of coal to multiple regression analysis to determine in advance a regression equation including the surface tension of coal as an objective variable and the physical property value and the total inert content as explanatory variables; and measuring the physical property value and the total inert content of a coal of which the surface tension is to be estimated, and calculating the surface tension of the coal with the measured physical property value and the measured total inert content, and the regression equation.

A coke product configured to be used in foundry cupolas to melt iron and produce cast iron products is disclosed herein. In some embodiments, the coke product has a Coke Reactivity Index (CRI) of at least 30% and an ash fusion temperature (AFT) less than 1316? C. Additionally or alternatively, the coke product can comprise (i) an ash content of at least 8.0%, (ii) a volatile matter content of no more than 1.0%, (iii) a Coke Strength After Reaction (CSR) of no more than 40%, (iv) a 2-inch drop shatter of at least 90%, and/or (v) a fixed carbon content of at least 85%.

A composite catalyst for coal depolymerization, the catalyst includes an agent A and an agent B. The agent A includes an iron salt-based catalyst, and the agent B includes a metal salt-based catalyst different from the iron salt-based catalyst. The agent A and the agent B are alternately added during use.

Processes and systems for olefin and diluent recovery utilizing one or more side columns, including a side rectifier column and/or a side degassing column, in combination with a heavies column.

Processes and systems for olefin and diluent recovery utilizing one or more side columns, including a side rectifier column and/or a side degassing column, in combination with a heavies column.

Surface-oxygenated biochar compositions and sonication-ozonization methods create advanced hydrophilic biochar materials having higher cation exchange capacity, optimized pH, improved wettability, and toxin free components. These sonicated and ozonized biochar compositions are used as filtration materials for clean water and air, as phosphorus solubilizing reagents to mix with phosphate rock materials to make a slow-releasing phosphate fertilizer, as biochar soil additives to help solubilize phosphorus and reduce phosphorus fertilizer additions required to achieve desired soil phosphorus activity, crop uptake, and yield goals, as sand soilization reagents by utilizing their liquid gel-forming activity in the spaces among sand particles to retain water and nutrients and hold the sand particles together, as plant growth stimulants by using the humic acids-like surface-oxygenated biochar substances at a proper ppm concentration and as carbon sequestration agents to help control climate change for energy and environmental sustainability on Earth.

Embodiments described herein relate to systems and methods of CO.sub.2 uptake. In one aspect, a method includes applying heat to a calciner to decompose a carbon-containing stream to a gas stream and a stream of a carbonation medium, the gas stream including CO.sub.2. The method further includes sequestering and/or utilizing the gas stream, feeding the stream of the carbonation medium to a carbonation station, contacting the carbonation medium with ambient air at the carbonation station, such that the carbonation medium adsorbs CO.sub.2 to form the carbon-containing stream, during the contacting, adding a water stream to the carbonation medium at intervals of about 30 minutes to about 72 hours, and feeding the carbon-containing stream to the calciner. In some embodiments, adding the water stream is via misting and/or spraying.

Embodiments described herein relate to systems and methods of CO.sub.2 uptake. In one aspect, a method includes applying heat to a calciner to decompose a carbon-containing stream to a gas stream and a stream of a carbonation medium, the gas stream including CO.sub.2. The method further includes sequestering and/or utilizing the gas stream, feeding the stream of the carbonation medium to a carbonation station, contacting the carbonation medium with ambient air at the carbonation station, such that the carbonation medium adsorbs CO.sub.2 to form the carbon-containing stream, during the contacting, adding a water stream to the carbonation medium at intervals of about 30 minutes to about 72 hours, and feeding the carbon-containing stream to the calciner. In some embodiments, adding the water stream is via misting and/or spraying.