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It is sold in raw material (in bulk) as pure powder and granular OR as finished products in the supermarket that can be directly (conveniently) used available as solid (such as Splenda) or liquid.

1. Pure sucralose
It is available in powder and granular form. China is the biggest manufacturer and exporter in the world, the export quantity in 2019 to United Status is around 2,000MT.

2. Splenda
Splenda is a common brand of the finished product of sucralose in the market and there are several types under this brand. Its no-calorie packet contains small amounts of the two carbs/bulking agents: dextrose and maltodextrin (1).

3. Liquid sucralose
It is a clear and colorless liquid and commonly sold in the market made of 25% of sucralose or with other concentrations, may contain very little composition of preservatives (such as potassium sorbate, sodium benzoate), acidulants (e.g. citric acid, succinic acid) and other components.

The liquid form is more stable and can extend the shelf life compared with the pure form.

It is recommended to use in PH level below 7 in general food, and PH below 8 in the bakery.
http://www.chinafooding.com/Sucralose

Erythorbic Acid is vitamin C a stereoisomer, and thus the chemical nature of vitamin C similar. Erythorbic Acid white to light yellow or crystal powder, odorless, acid taste, melting point 166-172 ℃, and decomposition, Erythorbic Acid gradually darken when exposed to light. Dry state, Erythorbic Acid fairly stable in the air, and in solution when exposed to air and rapidly degenerate, E315 almost no role in the physiological activity of ascorbic acid, Erythorbic Acid antioxidant properties than ascorbic acid, but the Erythorbic Acid poor heat resistance, reduced intensity, decomposition of heavy metal ions can promote Erythorbic Acid, Erythorbic Acid soluble in water at room temperature solubility of 40g/100ml, soluble in ethanol, 5g/100ml, insoluble in glycerin, insoluble in benzene, 1% aqueous solution of the PH value of 2.8. Antioxidant sodium erythorbate, far more than the antioxidant capacity of vitamin C, no vitamin C to strengthen the role, but the Erythorbic Acid will not hinder the bodys absorption and utilization of ascorbic acid. Human intake of E315, the body can be transformed into vitamin C. U.S. Food and Drug Administration (1980) Erythorbic Acid is generally recognized as safe substances.
http://www.chinafooding.com/Erythorbic_Acid

It can be produced by a reaction between methyl 2-keto-D-gluconate and sulphuric acid.

Generally, the manufacturing process has 5 steps:

Producing calcium 2-keto-D-gluconate: food-grade starch hydrolysate fermentation by Pseudomonas fluorescens with calcium carbonate.
Acidify the above fermentation broth to obtain 2-keto-D-gluconic acid (2-KG).
Esterification 2-KG with methanol under acid conditions to yield methyl 2-keto-D-gluconate.
The synthesis of sodium erythorbate: heating the above suspension with sodium bicarbonate or sodium carbonate.
The reaction between sodium erythorbate and sulphuric acid.
Structure
Erythorbic acid chemical structure

Properties
Appearance White to slightly yellow crystalline solid which darkens gradually on exposure to light.
Other names D-Isoascorbic acid; D-Araboascorbic acid
CAS number 89-65-6
Chemical formula C6H8O6
Molecular weight 176.13
PKa It is a diprotic acid having pKa’s 11.34 and 4.04.
Solubility
In water: 40 g in 100 mL water at 25 °C.
In organic solvents: Soluble in alcohol, pyridine; moderately soluble in acetone; slightly soluble in glycerol
http://www.chinafooding.com/Erythorbic_Acid

Available with us is an effective range of Benzoic Acid, which is appreciated in international market for precise pH and accurate composition. Due to these high end features, our range is extensively used in preserving foods, fats, fruit juices and alkaloidal solutions. Our range of Benzoic Acid is environment friendly and offered in 25 kg paper bags with liner and 500/1000 kg jumbo bags with liner.
http://www.chinafooding.com/Benzoic_Acid

There are two types of benzoic acid, one is the natural form extracted from plants and can be used as a flavor with the FEMA No. 2131. Another one is the most used one, obtained from toluene synthesis and here we would like to introduce the brief manufacturing process of this one.

Toluene oxidation
Benzoic acid is largely commercially produced by liquid-phase oxidation of toluene (from petrochemical processing) with oxygen in the presence of a cobalt catalyst.

benzoic acid production
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If for food and pharmaceutical applications, other manufacturing processes (e.g. sublimation, recrystallization and neutralization) need to be further performed to purify crude benzoic acid as it may contain by-products such as benzaldehyde, benzyl alcohol and benzyl benzoate. (1)

Other methods
Food grade benzoic acid can also be manufactured from the following two methods mentioned by the FDA (2):

molten phthalic anhydride with a zinc oxide catalyst
hydrolysis of benzotrichloride
By the way, benzoic acid can also be produced from sodium benzoate with HCL.

Specification
Other Names
Carboxybenzene
Benzenecarboxylic acid
Phenylmethanoic acid
CAS Number 65-85-0
Chemical formula C7H6O2 or C6H5COOH
Molar Mass 122.123 g·mol−1
Boiling Point 250 °C (482 °F; 523 K)
Melting Point 122 °C (252 °F; 395 K)
Properties
A white crystalline flake, needle, powder or granular with a benzoin or benzaldehyde odor.
Slightly soluble in water while easily soluble in ether, ethanol, dichloromethane, diethyl ether and other organic solvents.
A weak acid and has an acid taste that will influence the taste and PH of food.
Structure
benzoic acid chemical structure
Image Source

The structure is benzene with a carboxylic acid. It is made of the functional group carboxyl and aromatic benzene ring. There can be many derivatives generated by the reactions of these two functional groups with other chemicals.
http://www.chinafooding.com/Benzoic_Acid